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Constellation Perseus and Adromeda

Constellation Perseus and Adromeda

XLA3766618

Cone and Hubble Nebulae in the Unicorn - Cone and Hubble nebulae in Monoceros - The Cone nebula, at the bottom left, is an H II region located about 2600 years - light from Earth. The bright star in the middle left is S Monocerotis, a star of magnitude 4.7. Lower right, the Hubble nebula, overexposed. This large area of emission nebulosity and patch of blue reflection nebulosity also contains the Cone Nebula, a dark nebula at the lower right corner of the red nebulae. At the bottom right of the frame is NGC 2261, Hubble's Variable Nebula, in this image looking like an overexposed mis - shaped star because of the extreme processing needed to bring out the faint nebulosity in the Cone Nebula

Cone and Hubble Nebulae in the Unicorn - Cone and Hubble nebulae in Monoceros - The Cone nebula, at the bottom left, is an H II region located about 2600 years - light from Earth. The bright star in the middle left is S Monocerotis, a star of magnitude 4.7. Lower right, the Hubble nebula, overexposed. This large area of emission nebulosity and patch of blue reflection nebulosity also contains the Cone Nebula, a dark nebula at the lower right corner of the red nebulae. At the bottom right of the frame is NGC 2261, Hubble's Variable Nebula, in this image looking like an overexposed mis - shaped star because of the extreme processing needed to bring out the faint nebulosity in the Cone Nebula

Jerry Lodriguss

PIX4618584

Southern Crown Nebula - The CRA reflection nebula - R Coronae Australis is a region of star formations visible in the southern hemisphere. It is located about 500 light years away from Earth. On the right, the globular cluster NGC 6723, located 30 000 light years from Earth in Sagittarius. Image made with the 1.2m Telescope of Schmidt UK from Siding Spring. Corona Australis (the southern crown, CRA) is in the far southern sky but visible from the southern states of the USA. The constellation is small but distinctive. The conspicuous globular cluster NGC 6723 is at the western (right) edge of the photograph, but it is in Sagittarius, and is about 30,000 light years distant. Almost all the nebulosity here is starlight, reflected from minute grains of dust, some of which gather into darker condensations ('molecular clouds'), blotting out the background stars. Fainter features can be seen here. Shiny NGC 6726 - 27 near middle of image contains both a visual binary and a variable star. Other wispy nebulae in the western part of the dark cloud betray the presence of young, hidden stars — Southern Crown Nebula - The CRA reflection nebula - R Coronae Australis is a region of star formations visible in the southern hemisphere. It is located about 500 light years away from Earth. On the right, the globular cluster NGC 6723, located 30 000 light years from Earth in Sagittarius. Image made with the 1.2m Telescope of Schmidt UK from Siding Spring. Corona Australis (the southern crown, CRA) is in the far southern sky but visible from the southern states of the USA. The constellation is small but distinctive. The conspicuous globular cluster NGC 6723 is at the western (right) edge of the photograph, but it is in Sagittarius, and is about 30,000 light years distant. Almost all the nebulosity here is starlight, reflected from minute grains of dust, some of which gather into darker condensations ('molecular clouds'), blotting out the background stars. Fainter features can be seen here. Shiny NGC 6726 - 27 near middle of image contains both a visual binary and a variable star. Othe

Southern Crown Nebula - The CRA reflection nebula - R Coronae Australis is a region of star formations visible in the southern hemisphere. It is located about 500 light years away from Earth. On the right, the globular cluster NGC 6723, located 30 000 light years from Earth in Sagittarius. Image made with the 1.2m Telescope of Schmidt UK from Siding Spring. Corona Australis (the southern crown, CRA) is in the far southern sky but visible from the southern states of the USA. The constellation is small but distinctive. The conspicuous globular cluster NGC 6723 is at the western (right) edge of the photograph, but it is in Sagittarius, and is about 30,000 light years distant. Almost all the nebulosity here is starlight, reflected from minute grains of dust, some of which gather into darker condensations ('molecular clouds'), blotting out the background stars. Fainter features can be seen here. Shiny NGC 6726 - 27 near middle of image contains both a visual binary and a variable star. Othe

PIX4620295

Friedrich Wilhelm August Argelander

Friedrich Wilhelm August Argelander

XLF3792608

Aquarius Constellation - Constellation of Aquarius - Field around the Aquarius constelllation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best seen in the early evening in August

Aquarius Constellation - Constellation of Aquarius - Field around the Aquarius constelllation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best seen in the early evening in August

PIX4594332

Artist's view of a pulsating variable star - A pulsating variable star. Artwor

Artist's view of a pulsating variable star - A pulsating variable star. Artwor

S. Numazawa

PIX4572668

Whale Constellation - Constellation of Cetus - Also visible, the constellation Belier at the top of the picture. Cetus (the Whale or Sea Monster) is an ancient constellation in the northern sky depicting a whale - like creature basking on the shores of the fabled stream Eridanus, which flows from the celestial equator far into the southern sky. Cetus is extensive but not very distinctive, containing few bright stars. However, some of the stars are exceptionally interesting, particlarly Mira the wonderful, the prototype variable star, whose variability was first noted 400 years ago. The constellation of Aries is visible at the top of the image

Whale Constellation - Constellation of Cetus - Also visible, the constellation Belier at the top of the picture. Cetus (the Whale or Sea Monster) is an ancient constellation in the northern sky depicting a whale - like creature basking on the shores of the fabled stream Eridanus, which flows from the celestial equator far into the southern sky. Cetus is extensive but not very distinctive, containing few bright stars. However, some of the stars are exceptionally interesting, particlarly Mira the wonderful, the prototype variable star, whose variability was first noted 400 years ago. The constellation of Aries is visible at the top of the image

PIX4589130

Variable star Mira Ceti - Mira Ceti at maximum and minimum - View of variable star Mira has maximum and minimum

Variable star Mira Ceti - Mira Ceti at maximum and minimum - View of variable star Mira has maximum and minimum

PIX4572381

Whale Constellation - Constellation of Cetu

Whale Constellation - Constellation of Cetu

PIX4589151

Constellation Lievre - Constellation of Lepus - The constellation Lievre is located below the constellation Orion. On the left, the bright star Sirius. Despite the faintness of its stars, Lepus (the Hare) was known in ancient Greece, as was Orion the hunter, at whose feet it resides, inconspicuously. The hare (or rabbit) is a creature traditionally associated with the Moon, since, with imagination, the man in the Moon features can also be seen as a rabbit. This connection with Orion makes mythological sense, since the Moon was perpetually chased across the sky by the Sun and Orion is a Sun god. Lepus is a middling - sized constellation, ranking 51 in size in the modern 88. Its brightest star is Alpha Leporis (Arneb), from the Arabic al-arnab meaning 'the hare'. Also visible in the image is R Leporis, Hind's Crimson star, whose brightness varies over 5 magnitudes (100 times) over a period of 423 days. It is a carbon star and at its maximum is a fine sight in a small telescope or good binoculars — Constellation Lievre - Constellation of Lepus - The constellation Lievre is located below the constellation Orion. On the left, the bright star Sirius. Despite the faintness of its stars, Lepus (the Hare) was known in ancient Greece, as was Orion the hunter, at whose feet it resides, inconspicuously. The hare (or rabbit) is a creature traditionally associated with the Moon, since, with imagination, the man in the Moon features can also be seen as a rabbit. This connection with Orion makes mythological sense, since the Moon was perpetually chased across the sky by the Sun and Orion is a Sun god. Lepus is a middling - sized constellation, ranking 51 in size in the modern 88. Its brightest star is Alpha Leporis (Arneb), from the Arabic al-arnab meaning 'the hare'. Also visible in the image is R Leporis, Hind's Crimson star, whose brightness varies over 5 magnitudes (100 times) over a period of 423 days. It is a carbon star and at its maximum is a fine sight in a small telescope or good bi

Constellation Lievre - Constellation of Lepus - The constellation Lievre is located below the constellation Orion. On the left, the bright star Sirius. Despite the faintness of its stars, Lepus (the Hare) was known in ancient Greece, as was Orion the hunter, at whose feet it resides, inconspicuously. The hare (or rabbit) is a creature traditionally associated with the Moon, since, with imagination, the man in the Moon features can also be seen as a rabbit. This connection with Orion makes mythological sense, since the Moon was perpetually chased across the sky by the Sun and Orion is a Sun god. Lepus is a middling - sized constellation, ranking 51 in size in the modern 88. Its brightest star is Alpha Leporis (Arneb), from the Arabic al-arnab meaning 'the hare'. Also visible in the image is R Leporis, Hind's Crimson star, whose brightness varies over 5 magnitudes (100 times) over a period of 423 days. It is a carbon star and at its maximum is a fine sight in a small telescope or good bi

PIX4592022

Variable star PV Cephei and nebula Gyulbudagyan - Variable star PV Cephei with Gyulbudagyan's nebula - PV Cephei is an excessively fast variable star, moving almost 20 km per second in the interstellar medium. This young star, formed about 500,000 years ago, is now more than 30 years ago - light from its birthplace, the cluster of stars of the Iris nebula, NGC 7023. PV Cephei is the small orange star with a gas cloud located in the upper left middle of the image. Image obtained on October 19, 2008 with a telescope measuring 61 cm in diameter. PV Cephei is a variable star moving at roughly 20 km/sec through the interstellar medium. This young star was formed about 500,000 years ago and is located now at about 30 light years from its birth place, the star cluster of Iris nebula (NGC 7023). PV Cephei is the small oranged star visible near the middle of the image, at right of the brilliant blue star. It is associated with a small cloud of gas. Image taken on October 19 2008 with a 24 - inch telescope — Variable star PV Cephei and nebula Gyulbudagyan - Variable star PV Cephei with Gyulbudagyan's nebula - PV Cephei is an excessively fast variable star, moving almost 20 km per second in the interstellar medium. This young star, formed about 500,000 years ago, is now more than 30 years ago - light from its birthplace, the cluster of stars of the Iris nebula, NGC 7023. PV Cephei is the small orange star with a gas cloud located in the upper left middle of the image. Image obtained on October 19, 2008 with a telescope measuring 61 cm in diameter. PV Cephei is a variable star moving at roughly 20 km/sec through the interstellar medium. This young star was formed about 500,000 years ago and is located now at about 30 light years from its birth place, the star cluster of Iris nebula (NGC 7023). PV Cephei is the small oranged star visible near the middle of the image, at right of the brilliant blue star. It is associated with a small cloud of gas. Image taken on October 19 2008 with a 24 - inc

Variable star PV Cephei and nebula Gyulbudagyan - Variable star PV Cephei with Gyulbudagyan's nebula - PV Cephei is an excessively fast variable star, moving almost 20 km per second in the interstellar medium. This young star, formed about 500,000 years ago, is now more than 30 years ago - light from its birthplace, the cluster of stars of the Iris nebula, NGC 7023. PV Cephei is the small orange star with a gas cloud located in the upper left middle of the image. Image obtained on October 19, 2008 with a telescope measuring 61 cm in diameter. PV Cephei is a variable star moving at roughly 20 km/sec through the interstellar medium. This young star was formed about 500,000 years ago and is located now at about 30 light years from its birth place, the star cluster of Iris nebula (NGC 7023). PV Cephei is the small oranged star visible near the middle of the image, at right of the brilliant blue star. It is associated with a small cloud of gas. Image taken on October 19 2008 with a 24 - inc

Adam Block

PIX4572360

Nebula NGC 1555 and star T - Tauri - Nebula NGC 1555 with T - Tauri - Nebula NGC 1555 (Hind variable nebula) in the constellation Tauri. Within this nebula a yellow cloud surrounds a T - Tauri star, a very young star in formation. The orange star in this view is T Tauri, prototype of the class of T Tauri variable stars. Nearby it is a dusty yellow cosmic cloud historically known as Hind's Variable Nebula (NGC 1555/1554). Over 400 light - years away, at the edge of a molecular cloud, both star and nebula are seen to vary significantly in brightness but not necessarily at the same time, adding to the mystery of the intriguing region. T Tauri stars are now generally recognized as young (less than a few million years old), sun - like stars still in the early stages of formation

Nebula NGC 1555 and star T - Tauri - Nebula NGC 1555 with T - Tauri - Nebula NGC 1555 (Hind variable nebula) in the constellation Tauri. Within this nebula a yellow cloud surrounds a T - Tauri star, a very young star in formation. The orange star in this view is T Tauri, prototype of the class of T Tauri variable stars. Nearby it is a dusty yellow cosmic cloud historically known as Hind's Variable Nebula (NGC 1555/1554). Over 400 light - years away, at the edge of a molecular cloud, both star and nebula are seen to vary significantly in brightness but not necessarily at the same time, adding to the mystery of the intriguing region. T Tauri stars are now generally recognized as young (less than a few million years old), sun - like stars still in the early stages of formation

Adam Block

PIX4617573

Star V838 Monocerotis. 11/2005 - Star V838 Monocerotis seen by the Hubble space telescope. 11/2005 - This variable star is located about 20,000 years ago - light from Earth in the constellation Unicorn. Beginning in 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in November 2005 by the Hubble space telescope, the light echo reveals details in the interstellar dust surrounding the star. Light from a star that erupted almost five years ago continues propagating outward through a cloud of dust surrounding the star. The light reflects or “” echoes”” off the dust and then travels to Earth. Because of the extra distance the scattered light travels, it reaches the Earth long after the light from the stellar outburst itself. Therefore, a light echo is an analog of a sound echo produced, for example, when sound from an Alpine yodeler echoes off of the surrounding mountainsides. The echo comes from the unusual variable star V838 Monocerotis (V838 Mon), located 20,000 light - years away on the periphery of our Galaxy. In early 2002, V838 Mon increased in brightness temporarily to become 600,000 times brighter than our Sun. The reason for the eruption is still unclear — Star V838 Monocerotis. 11/2005 - Star V838 Monocerotis seen by the Hubble space telescope. 11/2005 - This variable star is located about 20,000 years ago - light from Earth in the constellation Unicorn. Beginning in 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in November 2005 by the Hubble space telescope, the light echo reveals details in the interstellar dust surrounding the star. Light from a star that erupted almost five years ago continues propagating outward through a cloud of dust surrounding the star. The light reflects or “” echoes”” off the dust and then travels to Earth. Because of the extra distance the scattered light travels, it reaches the Earth long after the light from the stellar outburst itself. Therefore, a light echo is an analog of a sound echo produced, for example, when sound from an Alpine yodeler echoes off of the surrounding mountainsides. The echo comes from the unusual variable star V838 Monocerotis (V

Star V838 Monocerotis. 11/2005 - Star V838 Monocerotis seen by the Hubble space telescope. 11/2005 - This variable star is located about 20,000 years ago - light from Earth in the constellation Unicorn. Beginning in 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in November 2005 by the Hubble space telescope, the light echo reveals details in the interstellar dust surrounding the star. Light from a star that erupted almost five years ago continues propagating outward through a cloud of dust surrounding the star. The light reflects or “” echoes”” off the dust and then travels to Earth. Because of the extra distance the scattered light travels, it reaches the Earth long after the light from the stellar outburst itself. Therefore, a light echo is an analog of a sound echo produced, for example, when sound from an Alpine yodeler echoes off of the surrounding mountainsides. The echo comes from the unusual variable star V838 Monocerotis (V

PIX4572295

Star V838 Monocerotis. 09/2006 - V838 Monocerotis seen by the Hubble space telescope. 09/2006 - This variable star is located about 20,000 years ago - light from Earth in the constellation of Unicorn. Beginning in 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in September 2006 by the Hubble space telescope, the light echo reveals details in the interstellar dust surrounding the star. Light from a star that erupted almost five years ago continues propagating outward through a cloud of dust surrounding the star. The light reflects or “” echoes”” off the dust and then travels to Earth. Because of the extra distance the scattered light travels, it reaches the Earth long after the light from the stellar outburst itself. Therefore, a light echo is an analog of a sound echo produced, for example, when sound from an Alpine yodeler echoes off of the surrounding mountainsides. The echo comes from the unusual variable star V838 Monocerotis (V838 Mon), located 20,000 light - years away on the periphery of our Galaxy. In early 2002, V838 Mon increased in brightness temporarily to become 600,000 times brighter than our Sun. The reason for the eruption is still unclear — Star V838 Monocerotis. 09/2006 - V838 Monocerotis seen by the Hubble space telescope. 09/2006 - This variable star is located about 20,000 years ago - light from Earth in the constellation of Unicorn. Beginning in 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in September 2006 by the Hubble space telescope, the light echo reveals details in the interstellar dust surrounding the star. Light from a star that erupted almost five years ago continues propagating outward through a cloud of dust surrounding the star. The light reflects or “” echoes”” off the dust and then travels to Earth. Because of the extra distance the scattered light travels, it reaches the Earth long after the light from the stellar outburst itself. Therefore, a light echo is an analog of a sound echo produced, for example, when sound from an Alpine yodeler echoes off of the surrounding mountainsides. The echo comes from the unusual variable star V838 Monocerotis (V8

Star V838 Monocerotis. 09/2006 - V838 Monocerotis seen by the Hubble space telescope. 09/2006 - This variable star is located about 20,000 years ago - light from Earth in the constellation of Unicorn. Beginning in 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in September 2006 by the Hubble space telescope, the light echo reveals details in the interstellar dust surrounding the star. Light from a star that erupted almost five years ago continues propagating outward through a cloud of dust surrounding the star. The light reflects or “” echoes”” off the dust and then travels to Earth. Because of the extra distance the scattered light travels, it reaches the Earth long after the light from the stellar outburst itself. Therefore, a light echo is an analog of a sound echo produced, for example, when sound from an Alpine yodeler echoes off of the surrounding mountainsides. The echo comes from the unusual variable star V838 Monocerotis (V8

PIX4572319

Whale Constellation - Constellation of Cetu

Whale Constellation - Constellation of Cetu

PIX4589123

Artist's view of an eruptive star - Flare star - Artwork: DG Canum Venaticorum (DG CVN) is a binary star located in the constellation Hunting Dogs. On 23 April 2014, a powerful gamma eruption from this system was recorded by the Swift satellite. DG Canum Venaticorum (DG CVN) is a binary star system in the northern constellation of Canes Venatici. On 2014 April 23, 2014, a gamma-ray superflare event was observed by the Swift satellite coming from the position of this system. It may have been perhaps the most luminous such events ever observed coming from a red dwarf star

Artist's view of an eruptive star - Flare star - Artwork: DG Canum Venaticorum (DG CVN) is a binary star located in the constellation Hunting Dogs. On 23 April 2014, a powerful gamma eruption from this system was recorded by the Swift satellite. DG Canum Venaticorum (DG CVN) is a binary star system in the northern constellation of Canes Venatici. On 2014 April 23, 2014, a gamma-ray superflare event was observed by the Swift satellite coming from the position of this system. It may have been perhaps the most luminous such events ever observed coming from a red dwarf star

PIX4572752

Star V838 Monocerotis 28/10/2004 - V838 Monocerotis 10/2004 - This variable star is located approximately 20,000 years - light from Earth in the constellation Unicorn. In the beginning of 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in October 2004 by the Hubble space telescope, the light echo shows details in the interstellar dust surrounding the star. In January 2002, a variable star in the Monoceros constellation suddenly became 600,000 times more luminous than our Sun, temporarily making it the brightest star in our Milky Way galaxy. The mysterious star, called V838 Monocerotis, has long since faded back to obscurity. Seen here by Nasa's Hubble Space Telescope on October 28, 2004, the light echo around the star has uncovered details in the interstellar dust round the star

Star V838 Monocerotis 28/10/2004 - V838 Monocerotis 10/2004 - This variable star is located approximately 20,000 years - light from Earth in the constellation Unicorn. In the beginning of 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in October 2004 by the Hubble space telescope, the light echo shows details in the interstellar dust surrounding the star. In January 2002, a variable star in the Monoceros constellation suddenly became 600,000 times more luminous than our Sun, temporarily making it the brightest star in our Milky Way galaxy. The mysterious star, called V838 Monocerotis, has long since faded back to obscurity. Seen here by Nasa's Hubble Space Telescope on October 28, 2004, the light echo around the star has uncovered details in the interstellar dust round the star

PIX4572282

Constellation of Cephee - Constellation of Cepheu

Constellation of Cephee - Constellation of Cepheu

Jerry Lodriguss

PIX4589786

Constellation of Cephee - Constellation of Cepheu

Constellation of Cephee - Constellation of Cepheu

B&S.Fletcher

PIX4589809

Cepheides in the galaxy M81 - Cepheids in the galaxy M81 - Cepheides are very bright variable stars that serve as cosmic beacons to measure distance from nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. Here, the space telescope identified cepheides in the M81 galaxy; astronomers were able to deduce a new distance for this galaxy; it would be 11 million years - light from Earth; previous estimates gave a figure of 18 million light years. Image obtained in 1993. Astronomers have discovered variable stars in the spiral galaxy M81, and measured the distance of the galaxy to be 11 million light - years (3.4 megaparsecs). They quote a 10% uncertainty in this result (plus or minus approximately one million light - years). Previous estimates of the galaxy's distance have ranged from 4.5 to 18 million light - years (1.4 to 5.6 megaparsecs). The astronomers used the Hubble '5 Wide Field & Planetary Camera to study two fields in M81. In each field they took 22 twenty - minute exposures spread over 14 months to find the variable stars and measure their periods and brightness. Cepheids are pulsating stars that become alternately brighter and fainter with periods ranging from 10 to 50 days. Astronomers have known for over 50 years that the periods of these stars precisely predict their total luminous power, which allows their distance to be measured. Messier 81 is a large spiral galaxy in the constellation Ursa Major. It is a rotating system of gas and stars similar to our own Galaxy, the Milky Way, but approximately twice as massive. This galaxy achieved prominence three months ago when the brightest northern supernova this century was discovered. In the expanding universe, the Hubble Constant (H0) is the ratio of the rec — Cepheides in the galaxy M81 - Cepheids in the galaxy M81 - Cepheides are very bright variable stars that serve as cosmic beacons to measure distance from nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. Here, the space telescope identified cepheides in the M81 galaxy; astronomers were able to deduce a new distance for this galaxy; it would be 11 million years - light from Earth; previous estimates gave a figure of 18 million light years. Image obtained in 1993. Astronomers have discovered variable stars in the spiral galaxy M81, and measured the distance of the galaxy to be 11 million light - years (3.4 megaparsecs). They quote a 10% uncertainty in this result (plus or minus approximately one million light - years). Previous estimates of the galaxy's distance have ranged from 4.5 to 18 million light - years (1.4 to 5.6 megaparsecs). The astrono

Cepheides in the galaxy M81 - Cepheids in the galaxy M81 - Cepheides are very bright variable stars that serve as cosmic beacons to measure distance from nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. Here, the space telescope identified cepheides in the M81 galaxy; astronomers were able to deduce a new distance for this galaxy; it would be 11 million years - light from Earth; previous estimates gave a figure of 18 million light years. Image obtained in 1993. Astronomers have discovered variable stars in the spiral galaxy M81, and measured the distance of the galaxy to be 11 million light - years (3.4 megaparsecs). They quote a 10% uncertainty in this result (plus or minus approximately one million light - years). Previous estimates of the galaxy's distance have ranged from 4.5 to 18 million light - years (1.4 to 5.6 megaparsecs). The astrono

PIX4572157

Star V838 Monocerotis - V838 Monocerotis light echo - This variable star is located approximately 20,000 years from Earth in the constellation Unicorn. In the beginning of 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here from May 2002 to October 2004 by the Hubble space telescope, the light echo shows details in the interstellar dust surrounding the star. In January 2002, a variable star in the Monoceros constellation suddenly became 600,000 times more luminous than our Sun, temporarily making it the brightest star in our Milky Way galaxy. The mysterious star, called V838 Monocerotis, has long since faded back to obscurity. Seen here by Nasa's Hubble Space Telescope from May 2002 to October 2004, the light echo around the star has uncovered details in the interstellar dust round the star

Star V838 Monocerotis - V838 Monocerotis light echo - This variable star is located approximately 20,000 years from Earth in the constellation Unicorn. In the beginning of 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here from May 2002 to October 2004 by the Hubble space telescope, the light echo shows details in the interstellar dust surrounding the star. In January 2002, a variable star in the Monoceros constellation suddenly became 600,000 times more luminous than our Sun, temporarily making it the brightest star in our Milky Way galaxy. The mysterious star, called V838 Monocerotis, has long since faded back to obscurity. Seen here by Nasa's Hubble Space Telescope from May 2002 to October 2004, the light echo around the star has uncovered details in the interstellar dust round the star

PIX4572304

Dark nebula and T star - Tauri in the Swan - Dark nebula and T - Tauri Star in Cygnus - Dark nebula LDN 981 with at its extremite (at the top of the picture) the variable star T - Tauri V1331 Cygni. V1331 Cyg is a variable T - Tauri star located at the tip (top of image) of a long dust filament linking it to the dark cloud LDN 981

Dark nebula and T star - Tauri in the Swan - Dark nebula and T - Tauri Star in Cygnus - Dark nebula LDN 981 with at its extremite (at the top of the picture) the variable star T - Tauri V1331 Cygni. V1331 Cyg is a variable T - Tauri star located at the tip (top of image) of a long dust filament linking it to the dark cloud LDN 981

Adam Block

PIX4621785

Whale Constellation - Constellation of Cetus - Also visible, the constellation Belier at the top of the picture. Cetus (the Whale or Sea Monster) is an ancient constellation in the northern sky depicting a whale - like creature basking on the shores of the fabled stream Eridanus, which flows from the celestial equator far into the southern sky. Cetus is extensive but not very distinctive, containing few bright stars. However, some of the stars are exceptionally interesting, particlarly Mira the wonderful, the prototype variable star, whose variability was first noted 400 years ago. The constellation of Aries is visible at the top of the image

Whale Constellation - Constellation of Cetus - Also visible, the constellation Belier at the top of the picture. Cetus (the Whale or Sea Monster) is an ancient constellation in the northern sky depicting a whale - like creature basking on the shores of the fabled stream Eridanus, which flows from the celestial equator far into the southern sky. Cetus is extensive but not very distinctive, containing few bright stars. However, some of the stars are exceptionally interesting, particlarly Mira the wonderful, the prototype variable star, whose variability was first noted 400 years ago. The constellation of Aries is visible at the top of the image

PIX4589136

Polaris - Illustration - Polaris System - Illustration - Polaris is a triple system composed of a supergiant star and two dwarf stars. It is a pulsating variable star, cepheide of low amplitude. This illustration shows the triple system of this star, Polaris A and Polaris Ab, and further on, his companion Polaris B. This is a view from within the Polaris triple star system. The North Star, Polaris A is a bright supergiant variable star.Just above Polaris is a small companion, Polaris Ab, which is 2 billion miles from Polaris. Much farther away, near the top of the illustration, is the wide companion Polaris B. Polaris B is located approximately 240 billion miles from Polaris A. The two companion stars are the same temperature as Polaris A, but are dwarf stars. The wide companion star is visible in small telescopes. It was first noticed by William Herschel in 1780. The close companion, Polaris Ab was known to exist from measurements of a wobble in Polaris, caused by the gravitational tug of its companion, but has only been seen directly now using Hubble — Polaris - Illustration - Polaris System - Illustration - Polaris is a triple system composed of a supergiant star and two dwarf stars. It is a pulsating variable star, cepheide of low amplitude. This illustration shows the triple system of this star, Polaris A and Polaris Ab, and further on, his companion Polaris B. This is a view from within the Polaris triple star system. The North Star, Polaris A is a bright supergiant variable star.Just above Polaris is a small companion, Polaris Ab, which is 2 billion miles from Polaris. Much farther away, near the top of the illustration, is the wide companion Polaris B. Polaris B is located approximately 240 billion miles from Polaris A. The two companion stars are the same temperature as Polaris A, but are dwarf stars. The wide companion star is visible in small telescopes. It was first noticed by William Herschel in 1780. The close companion, Polaris Ab was known to exist from measurements of a wobble in Polaris, caused by the gravitational tu

Polaris - Illustration - Polaris System - Illustration - Polaris is a triple system composed of a supergiant star and two dwarf stars. It is a pulsating variable star, cepheide of low amplitude. This illustration shows the triple system of this star, Polaris A and Polaris Ab, and further on, his companion Polaris B. This is a view from within the Polaris triple star system. The North Star, Polaris A is a bright supergiant variable star.Just above Polaris is a small companion, Polaris Ab, which is 2 billion miles from Polaris. Much farther away, near the top of the illustration, is the wide companion Polaris B. Polaris B is located approximately 240 billion miles from Polaris A. The two companion stars are the same temperature as Polaris A, but are dwarf stars. The wide companion star is visible in small telescopes. It was first noticed by William Herschel in 1780. The close companion, Polaris Ab was known to exist from measurements of a wobble in Polaris, caused by the gravitational tu

PIX4572039

Variable star Mira Ceti view in ultraviolet - Star Mira Ceti seen in ultraviolet - Ultraviolet view of the star Mira of the Whale revealing a long train of material ejected by the large red star. This trail extends over 13 years - light. Mosaic of images obtained by the Galex satellite in November and December 2006. Ultraviolet image of the star Mira taken with the Galex satellite in November and December 2006. In this image, Mira is moving from left to right. It is visible as the small white dot in the bulb shape at right. The shed material can be seen in light blue. The dots in the picture are stars and distant galaxies. The large blue dot at left is a star that is closer to us than Mira. Mira is traveling so fast (130 kilometers per second) that it's creating a bow shock, or build - up of gas, in front of it, as can be seen here at right

Variable star Mira Ceti view in ultraviolet - Star Mira Ceti seen in ultraviolet - Ultraviolet view of the star Mira of the Whale revealing a long train of material ejected by the large red star. This trail extends over 13 years - light. Mosaic of images obtained by the Galex satellite in November and December 2006. Ultraviolet image of the star Mira taken with the Galex satellite in November and December 2006. In this image, Mira is moving from left to right. It is visible as the small white dot in the bulb shape at right. The shed material can be seen in light blue. The dots in the picture are stars and distant galaxies. The large blue dot at left is a star that is closer to us than Mira. Mira is traveling so fast (130 kilometers per second) that it's creating a bow shock, or build - up of gas, in front of it, as can be seen here at right

PIX4572330

Star V838 Monocerotis 08/02/2004 - V838 Monocerotis 02/2004 - This variable star is located approximately 20,000 years - light from Earth in the constellation Unicorn. In the beginning of 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in February 2004 by the Hubble space telescope, the light echo shows details in the interstellar dust surrounding the star. In January 2002, a variable star in the Monoceros constellation suddenly became 600,000 times more luminous than our Sun, temporarily making it the brightest star in our Milky Way galaxy. The mysterious star, called V838 Monocerotis, has long since faded back to obscurity. Seen here by Nasa's Hubble Space Telescope on February 8, 2004, the light echo around the star has uncovered details in the interstellar dust round the star

Star V838 Monocerotis 08/02/2004 - V838 Monocerotis 02/2004 - This variable star is located approximately 20,000 years - light from Earth in the constellation Unicorn. In the beginning of 2002, this star illuminated temporarily becoming one of the brightest stars in the sky. Viewed here in February 2004 by the Hubble space telescope, the light echo shows details in the interstellar dust surrounding the star. In January 2002, a variable star in the Monoceros constellation suddenly became 600,000 times more luminous than our Sun, temporarily making it the brightest star in our Milky Way galaxy. The mysterious star, called V838 Monocerotis, has long since faded back to obscurity. Seen here by Nasa's Hubble Space Telescope on February 8, 2004, the light echo around the star has uncovered details in the interstellar dust round the star

PIX4572272

Constellation Lievre - Constellation of Lepus - The constellation Lievre is located below the constellation Orion. On the left, the bright star Sirius. Despite the faintness of its stars, Lepus (the Hare) was known in ancient Greece, as was Orion the hunter, at whose feet it resides, inconspicuously. The hare (or rabbit) is a creature traditionally associated with the Moon, since, with imagination, the man in the Moon features can also be seen as a rabbit. This connection with Orion makes mythological sense, since the Moon was perpetually chased across the sky by the Sun and Orion is a Sun god. Lepus is a middling - sized constellation, ranking 51 in size in the modern 88. Its brightest star is Alpha Leporis (Arneb), from the Arabic al-arnab meaning 'the hare'. Also visible in the image is R Leporis, Hind's Crimson star, whose brightness varies over 5 magnitudes (100 times) over a period of 423 days. It is a carbon star and at its maximum is a fine sight in a small telescope or good binoculars — Constellation Lievre - Constellation of Lepus - The constellation Lievre is located below the constellation Orion. On the left, the bright star Sirius. Despite the faintness of its stars, Lepus (the Hare) was known in ancient Greece, as was Orion the hunter, at whose feet it resides, inconspicuously. The hare (or rabbit) is a creature traditionally associated with the Moon, since, with imagination, the man in the Moon features can also be seen as a rabbit. This connection with Orion makes mythological sense, since the Moon was perpetually chased across the sky by the Sun and Orion is a Sun god. Lepus is a middling - sized constellation, ranking 51 in size in the modern 88. Its brightest star is Alpha Leporis (Arneb), from the Arabic al-arnab meaning 'the hare'. Also visible in the image is R Leporis, Hind's Crimson star, whose brightness varies over 5 magnitudes (100 times) over a period of 423 days. It is a carbon star and at its maximum is a fine sight in a small telescope or good bi

Constellation Lievre - Constellation of Lepus - The constellation Lievre is located below the constellation Orion. On the left, the bright star Sirius. Despite the faintness of its stars, Lepus (the Hare) was known in ancient Greece, as was Orion the hunter, at whose feet it resides, inconspicuously. The hare (or rabbit) is a creature traditionally associated with the Moon, since, with imagination, the man in the Moon features can also be seen as a rabbit. This connection with Orion makes mythological sense, since the Moon was perpetually chased across the sky by the Sun and Orion is a Sun god. Lepus is a middling - sized constellation, ranking 51 in size in the modern 88. Its brightest star is Alpha Leporis (Arneb), from the Arabic al-arnab meaning 'the hare'. Also visible in the image is R Leporis, Hind's Crimson star, whose brightness varies over 5 magnitudes (100 times) over a period of 423 days. It is a carbon star and at its maximum is a fine sight in a small telescope or good bi

PIX4592024

Detail of the Galaxy of Andromede and Cepheide M31_V1 - M31, Andromeda Galaxy, and Cepheid M31_V1 - The galaxy of Andromede (M31) is located about 2 million years ago - light from Earth. Here, a detail on the galaxy showing the region around M31_V1, the first cepheide discovered in M31 by Edwin Hubble. M31, the Great galaxy in Andromeda, is a gigantic collection of more than 300 billion stars and is located about 2 million light years from Earth. This image shows a part of the galaxy around M31_V1, the first Cepheid Variable star in M31 discovered by Edwin Hubble

Detail of the Galaxy of Andromede and Cepheide M31_V1 - M31, Andromeda Galaxy, and Cepheid M31_V1 - The galaxy of Andromede (M31) is located about 2 million years ago - light from Earth. Here, a detail on the galaxy showing the region around M31_V1, the first cepheide discovered in M31 by Edwin Hubble. M31, the Great galaxy in Andromeda, is a gigantic collection of more than 300 billion stars and is located about 2 million light years from Earth. This image shows a part of the galaxy around M31_V1, the first Cepheid Variable star in M31 discovered by Edwin Hubble

PIX4608887

Red Dwarf Star Proxima of Centauri - Proxima Centauri in X - Ray - Proxima of Centaur (in the center of the image) is the closest star to the Sun, at a distance of 4.2 years - light. It belongs to the triple Alpha star system of the Centaurus being the least bright star of this system; it is a red dwarf star. X-ray image obtained by the Chandra space telescope. Chandra and XMM - Newton observations of the red dwarf star Proxima Centauri have shown that its surface is in a state of turmoil. Flares, or explosive outbursts, occur almost continually. This behavior can be traced to Proxima Centauri's low mass, about a tenth that of the Sun. In the cores of low mass stars, nuclear fusion reactions that convert hydrogen to helium proceed very slowly, and create a turbulent, convective motion throughout their interiors. This motion stores up magnetic energy which is often released explosively in the star's upper atmosphere where it produces flares in X - rays and other forms of light. The same process produces X - rays on the Sun, but the magnetic energy is released in a less explosive manner through heating loops of gas, with occasional flares. The difference is due to the size of the convection zone, which in a more massive star such as the Sun, is smaller and closer to its surface. Red dwarfs are the most common type of star. They have masses between about 8% and 50% of the mass of the Sun. Though they are much dimmer than the Sun, they will shine for much longer - trillions of years in the case of Proxima Centauri, compared to the estimated 10 billion - year lifetime of the Sun. X - rays from Proxima Centauri are consistent with a point - like source. The extended X - ray glow is an instrumental effect. The nature of the two dots above the image is unknown - they could be background sources — Red Dwarf Star Proxima of Centauri - Proxima Centauri in X - Ray - Proxima of Centaur (in the center of the image) is the closest star to the Sun, at a distance of 4.2 years - light. It belongs to the triple Alpha star system of the Centaurus being the least bright star of this system; it is a red dwarf star. X-ray image obtained by the Chandra space telescope. Chandra and XMM - Newton observations of the red dwarf star Proxima Centauri have shown that its surface is in a state of turmoil. Flares, or explosive outbursts, occur almost continually. This behavior can be traced to Proxima Centauri's low mass, about a tenth that of the Sun. In the cores of low mass stars, nuclear fusion reactions that convert hydrogen to helium proceed very slowly, and create a turbulent, convective motion throughout their interiors. This motion stores up magnetic energy which is often released explosively in the star's upper atmosphere where it produces flares in X - rays and other forms of light. The same

Red Dwarf Star Proxima of Centauri - Proxima Centauri in X - Ray - Proxima of Centaur (in the center of the image) is the closest star to the Sun, at a distance of 4.2 years - light. It belongs to the triple Alpha star system of the Centaurus being the least bright star of this system; it is a red dwarf star. X-ray image obtained by the Chandra space telescope. Chandra and XMM - Newton observations of the red dwarf star Proxima Centauri have shown that its surface is in a state of turmoil. Flares, or explosive outbursts, occur almost continually. This behavior can be traced to Proxima Centauri's low mass, about a tenth that of the Sun. In the cores of low mass stars, nuclear fusion reactions that convert hydrogen to helium proceed very slowly, and create a turbulent, convective motion throughout their interiors. This motion stores up magnetic energy which is often released explosively in the star's upper atmosphere where it produces flares in X - rays and other forms of light. The same

PIX4571790

Cephee Constellation - Constellation of Cepheus - At the bottom left, the constellation Cassiopee; at the top, the bright star is the polar star. Cepheus is a representation of King Cepheus of Ethiopia, who has stellar connections, being husband to Cassiopeia and the father of Andromeda. It is a large northern constellation of 588 square degrees, 27th out of 88 in size and is best seen in the early evening in November. It is distinguished by having two unusual stars that are easily seen. Delta Cephei is the prototype for an intrinsically bright class of regularly pulsating variable stars whose period of variability is closely related to their absolute magnitudes. The brightest stars have the longest period, so distance can be estimated by measuring the period and the apparent magnitude of a star. And these stars are bright, so the method can be extended to nearby galaxies. Mu (u) Cephei is an extremely red, irregular variable star easily seen in binoculars. This too is a prototype, of a class of stars known as semi - regular variables — Cephee Constellation - Constellation of Cepheus - At the bottom left, the constellation Cassiopee; at the top, the bright star is the polar star. Cepheus is a representation of King Cepheus of Ethiopia, who has stellar connections, being husband to Cassiopeia and the father of Andromeda. It is a large northern constellation of 588 square degrees, 27th out of 88 in size and is best seen in the early evening in November. It is distinguished by having two unusual stars that are easily seen. Delta Cephei is the prototype for an intrinsically bright class of regularly pulsating variable stars whose period of variability is closely related to their absolute magnitudes. The brightest stars have the longest period, so distance can be estimated by measuring the period and the apparent magnitude of a star. And these stars are bright, so the method can be extended to nearby galaxies. Mu (u) Cephei is an extremely red, irregular variable star easily seen in binoculars. This too is a prototype, of

Cephee Constellation - Constellation of Cepheus - At the bottom left, the constellation Cassiopee; at the top, the bright star is the polar star. Cepheus is a representation of King Cepheus of Ethiopia, who has stellar connections, being husband to Cassiopeia and the father of Andromeda. It is a large northern constellation of 588 square degrees, 27th out of 88 in size and is best seen in the early evening in November. It is distinguished by having two unusual stars that are easily seen. Delta Cephei is the prototype for an intrinsically bright class of regularly pulsating variable stars whose period of variability is closely related to their absolute magnitudes. The brightest stars have the longest period, so distance can be estimated by measuring the period and the apparent magnitude of a star. And these stars are bright, so the method can be extended to nearby galaxies. Mu (u) Cephei is an extremely red, irregular variable star easily seen in binoculars. This too is a prototype, of

PIX4589796

Centaur Omega globular cluster - The globular cluster Omega Centauri NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the oldest objects in our galaxy. Omega Centauri is located about 17,000 light years from Earth in the constellation of Centaurus and contains several million stars. It is also one of the oldest objects of our galaxy

Centaur Omega globular cluster - The globular cluster Omega Centauri NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the oldest objects in our galaxy. Omega Centauri is located about 17,000 light years from Earth in the constellation of Centaurus and contains several million stars. It is also one of the oldest objects of our galaxy

Stephane Guisard

PIX4564396

Cepheide RS Puppis - Cepheides are very bright variable stars that serve as cosmic beacons to measure the distance of nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. Here, the space telescope photographed one of the brightest cepheids, RS Puppis (in the center of the image), located 6500 years - light in the southern constellation of the Puppi. The bright southern hemisphere star RS Puppis, at the center of the image, is swaddled in a gossamer cocoon of reflective dust illuminated by the glittering star. The super star is ten times more massive than our Sun and 200 times larger. RS Puppis rhythmically brightens and dims over a six - week cycle. It is one of the most luminous in the class of so - called Cepheid variable stars. Its average intrinsic brightness is 15,000 times greater than our Sun's luminosity. The nebula flickers in brightness as pulses of light from the Cepheid propagate outwards. By observing the fluctuation of light in RS Puppis itself, as well as recording the faint reflections of light pulses moving across the nebula, astronomers are able to measure these light echoes and pin down a very accurate distance. The distance to RS Puppis has been narrowed down to 6,500 light - years (with a margin of error of only one percent) — Cepheide RS Puppis - Cepheides are very bright variable stars that serve as cosmic beacons to measure the distance of nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. Here, the space telescope photographed one of the brightest cepheids, RS Puppis (in the center of the image), located 6500 years - light in the southern constellation of the Puppi. The bright southern hemisphere star RS Puppis, at the center of the image, is swaddled in a gossamer cocoon of reflective dust illuminated by the glittering star. The super star is ten times more massive than our Sun and 200 times larger. RS Puppis rhythmically brightens and dims over a six - week cycle. It is one of the most luminous in the class of so - called Cepheid variable stars. Its average intrinsic brightness is 15,000 times greater than our Sun's luminosity. The nebula flickers in brightness a

Cepheide RS Puppis - Cepheides are very bright variable stars that serve as cosmic beacons to measure the distance of nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. Here, the space telescope photographed one of the brightest cepheids, RS Puppis (in the center of the image), located 6500 years - light in the southern constellation of the Puppi. The bright southern hemisphere star RS Puppis, at the center of the image, is swaddled in a gossamer cocoon of reflective dust illuminated by the glittering star. The super star is ten times more massive than our Sun and 200 times larger. RS Puppis rhythmically brightens and dims over a six - week cycle. It is one of the most luminous in the class of so - called Cepheid variable stars. Its average intrinsic brightness is 15,000 times greater than our Sun's luminosity. The nebula flickers in brightness a

PIX4572188

Centaur Omega globular cluster - The globular cluster Omega Centauri NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the most ancient objects in our galaxy. NGC 5139 is the largest and most spectacular globular cluster in the entire night sky, and the largest in our galaxy. At 36 arc minutes, Omega Centauri is larger than the full moon in apparent size. It is located about 17,000 light years away from our Sun and at 4th magnitude, is easily visible without a telescope as a “” star”” in the constellation of Centaurus. It contains about 2 million stars, almost twice as many as M13. The stars in globular clusters are generally older, redder and less massive than our Sun

Centaur Omega globular cluster - The globular cluster Omega Centauri NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the most ancient objects in our galaxy. NGC 5139 is the largest and most spectacular globular cluster in the entire night sky, and the largest in our galaxy. At 36 arc minutes, Omega Centauri is larger than the full moon in apparent size. It is located about 17,000 light years away from our Sun and at 4th magnitude, is easily visible without a telescope as a “” star”” in the constellation of Centaurus. It contains about 2 million stars, almost twice as many as M13. The stars in globular clusters are generally older, redder and less massive than our Sun

Stephane Guisard

PIX4564418

Centaur Omega globular cluster - The globular cluster Omega Centauri NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the oldest objects in our galaxy. Omega Centauri is a globular cluster of stars seen in the contellation of Centaurus and is located about 17,000 light - years from Earth. It is one of the oldest object of our galaxy and contains several million stars

Centaur Omega globular cluster - The globular cluster Omega Centauri NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the oldest objects in our galaxy. Omega Centauri is a globular cluster of stars seen in the contellation of Centaurus and is located about 17,000 light - years from Earth. It is one of the oldest object of our galaxy and contains several million stars

W. Promper

PIX4564399

Artist's view of Beta Lyrae - Beta Lyrae artwork - Artist's view of Beta Lyrae (Sheliak), an eclipse binary star located in the constellation of Lyra. Beta Lyrae (Sheliak) is a binary star located in the constellation of Lyra

Artist's view of Beta Lyrae - Beta Lyrae artwork - Artist's view of Beta Lyrae (Sheliak), an eclipse binary star located in the constellation of Lyra. Beta Lyrae (Sheliak) is a binary star located in the constellation of Lyra

S. Numazawa

PIX4572568

Exoplanete around Mira Ceti - Artist view - Mira Ceti seen from an exoplanet: The star Mira Ceti seen from the surface of an extrasolar planet - Mira is a binary star of the constellation of the Whale, consisting of a red giant, and a white dwarf - Mira Ceti is a binary stellar system, consisting of a variable red giant a white dwarf companion

Exoplanete around Mira Ceti - Artist view - Mira Ceti seen from an exoplanet: The star Mira Ceti seen from the surface of an extrasolar planet - Mira is a binary star of the constellation of the Whale, consisting of a red giant, and a white dwarf - Mira Ceti is a binary stellar system, consisting of a variable red giant a white dwarf companion

Miller, Ron (b.1947)

PIX4607535

Exoplanete around W Ursae Majoris - Artist view: W Ursae Majoris is a system of binary stars in the constellation of the Great Bear - W Ursae Majoris (W UMA) is the variable star designation for a binary star system in the northern constellation of Ursa Major

Exoplanete around W Ursae Majoris - Artist view: W Ursae Majoris is a system of binary stars in the constellation of the Great Bear - W Ursae Majoris (W UMA) is the variable star designation for a binary star system in the northern constellation of Ursa Major

Miller, Ron (b.1947)

PIX4607971

Centaur Omega globular cluster - NGC 5139 Omega Centauri globular cluster - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centaur contains several million stars and is one of the older objects in our galaxy. The globular cluster Omega Centauri - - with as many as ten million stars - - is seen in all its splendour in this image captured with the WFI camera from Eso's La Silla Observatory. The image shows only the central part of the cluster - - about the size of the full moon on the sky (half a degree). North is up, East is to the left. This colour image is a composite of B, V and I filtered images. Note that because WFI is equipped with a mosaic detector, there are two small gaps in the image which were filled with lower quality data from the Digitized Sky Survey. Containing millions of stars, this globular cluster is located roughly 17,000 light - years from Earth in the constellation of Centaurus. Omega Centauri is about 150 light - years across; it is the most massive of all the Milky Way's globular clusters and thought to be around 12 billion years old — Centaur Omega globular cluster - NGC 5139 Omega Centauri globular cluster - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centaur contains several million stars and is one of the older objects in our galaxy. The globular cluster Omega Centauri - - with as many as ten million stars - - is seen in all its splendour in this image captured with the WFI camera from Eso's La Silla Observatory. The image shows only the central part of the cluster - - about the size of the full moon on the sky (half a degree). North is up, East is to the left. This colour image is a composite of B, V and I filtered images. Note that because WFI is equipped with a mosaic detector, there are two small gaps in the image which were filled with lower quality data from the Digitized Sky Survey. Containing millions of stars, this globular cluster is located roughly 17,000 light - years from Earth in the constellation of Centaurus. Omega Centauri is about 150 light - years

Centaur Omega globular cluster - NGC 5139 Omega Centauri globular cluster - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centaur contains several million stars and is one of the older objects in our galaxy. The globular cluster Omega Centauri - - with as many as ten million stars - - is seen in all its splendour in this image captured with the WFI camera from Eso's La Silla Observatory. The image shows only the central part of the cluster - - about the size of the full moon on the sky (half a degree). North is up, East is to the left. This colour image is a composite of B, V and I filtered images. Note that because WFI is equipped with a mosaic detector, there are two small gaps in the image which were filled with lower quality data from the Digitized Sky Survey. Containing millions of stars, this globular cluster is located roughly 17,000 light - years from Earth in the constellation of Centaurus. Omega Centauri is about 150 light - years

PIX4564443

Centaur Omega globular cluster - The globular cluster Omega Centauri, NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the most ancient objects in our galaxy. Image obtained by the VST (VLT Survey Telescope) in Chile. The second released VST (VLT Survey Telescope) image may be the best portrait of the globular star cluster Omega Centauri ever made. Omega Centauri, in the constellation of Centaurus (The Centaur), is the largest globular cluster in the sky, but the very wide field of view of VST and its powerful camera Omegaam can include even the faint outer regions of this spectacular object. This view includes about 300,000 stars

Centaur Omega globular cluster - The globular cluster Omega Centauri, NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the most ancient objects in our galaxy. Image obtained by the VST (VLT Survey Telescope) in Chile. The second released VST (VLT Survey Telescope) image may be the best portrait of the globular star cluster Omega Centauri ever made. Omega Centauri, in the constellation of Centaurus (The Centaur), is the largest globular cluster in the sky, but the very wide field of view of VST and its powerful camera Omegaam can include even the faint outer regions of this spectacular object. This view includes about 300,000 stars

PIX4564449

Barree spiral galaxy NGC 4639 in Virgo - Barred galaxy NGC 4639 in Virgo - The barree spiral galaxy NGC 4639 is located 78 million years - light in the Virgin's galaxy cluster. The blue dots visible on this image obtained by the Hubble Space Telescope are young stars. Other stars, cepheides have also been observed in this galaxy, allowing us to measure their distance with precision. This Hubble Space Telescope image shows NGC 4639, a spiral galaxy located 78 million light - years away in the Virgo cluster of galaxies. The blue dots in the galaxy's outlying regions indicate the presence of young stars. Among them are older, bright stars called Cepheids, which are used as reliable milepost markers to obtain accurate distances to nearby galaxies. Astronomers measure the brightness of Cepheids to calculate the distance to a galaxy. After using Cepheids to calculate the distance to NGC 4639, the team compared the results to the peak brightness measurements of SN 1990N, a type Ia supernova located in the galaxy. Then they compared those numbers with the peak brightness of supernovae similarly calibrated in nearby galaxies. The team then determined that type Ia supernovae are reliable secondary distance markers, and can be used to determine distances to galaxies several hundred times farther away than Cepheids. An accurate value for the Hubble Constant depends on Cepheids and secondary distance methods. The color image was made from separate exposures taken in the visible and near - infrared regions of the spectrum with the Wide Field Planetary Camera 2 — Barree spiral galaxy NGC 4639 in Virgo - Barred galaxy NGC 4639 in Virgo - The barree spiral galaxy NGC 4639 is located 78 million years - light in the Virgin's galaxy cluster. The blue dots visible on this image obtained by the Hubble Space Telescope are young stars. Other stars, cepheides have also been observed in this galaxy, allowing us to measure their distance with precision. This Hubble Space Telescope image shows NGC 4639, a spiral galaxy located 78 million light - years away in the Virgo cluster of galaxies. The blue dots in the galaxy's outlying regions indicate the presence of young stars. Among them are older, bright stars called Cepheids, which are used as reliable milepost markers to obtain accurate distances to nearby galaxies. Astronomers measure the brightness of Cepheids to calculate the distance to a galaxy. After using Cepheids to calculate the distance to NGC 4639, the team compared the results to the peak brightness measurements of SN 1990N, a type Ia supernova l

Barree spiral galaxy NGC 4639 in Virgo - Barred galaxy NGC 4639 in Virgo - The barree spiral galaxy NGC 4639 is located 78 million years - light in the Virgin's galaxy cluster. The blue dots visible on this image obtained by the Hubble Space Telescope are young stars. Other stars, cepheides have also been observed in this galaxy, allowing us to measure their distance with precision. This Hubble Space Telescope image shows NGC 4639, a spiral galaxy located 78 million light - years away in the Virgo cluster of galaxies. The blue dots in the galaxy's outlying regions indicate the presence of young stars. Among them are older, bright stars called Cepheids, which are used as reliable milepost markers to obtain accurate distances to nearby galaxies. Astronomers measure the brightness of Cepheids to calculate the distance to a galaxy. After using Cepheids to calculate the distance to NGC 4639, the team compared the results to the peak brightness measurements of SN 1990N, a type Ia supernova l

PIX4611731

Centaur Omega globular cluster - NGC 5139 Omega Centauri globular cluster - Visible to the naked eye in the southern hemisphere, Centaurus Omega is the most massive globular cluster in the galaxy. About 17,000 light years ago, millions of stars nearly 12 billion years old are concentrated here. 4-hour installation with a telescope 40 cm diameter. NGC 5139 is the largest and most spectacular globular cluster in the entire night sky, and the largest in our galaxy. At 36 arc minutes, Omega Centauri is larger than the full moon in apparent size. It is located about 17,000 light years away from our Sun and at 4th magnitude, is easily visible without a telescope as a “” star”” in the constellation of Centaurus. Total Exposure 4 Hours with a 14.5”” RCOS telescope

Centaur Omega globular cluster - NGC 5139 Omega Centauri globular cluster - Visible to the naked eye in the southern hemisphere, Centaurus Omega is the most massive globular cluster in the galaxy. About 17,000 light years ago, millions of stars nearly 12 billion years old are concentrated here. 4-hour installation with a telescope 40 cm diameter. NGC 5139 is the largest and most spectacular globular cluster in the entire night sky, and the largest in our galaxy. At 36 arc minutes, Omega Centauri is larger than the full moon in apparent size. It is located about 17,000 light years away from our Sun and at 4th magnitude, is easily visible without a telescope as a “” star”” in the constellation of Centaurus. Total Exposure 4 Hours with a 14.5”” RCOS telescope

R. Gendler

PIX4564432

Spiral galaxy NGC 5584 - Spiral galaxy NGC 5584 - NGC 5584 is located 72 million light years from Earth in the constellation Virgin. This galaxy is home to many Cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Image obtained by the Hubble Space Telescope. The brilliant, blue glow of young stars traces the graceful spiral arms of galaxy NGC 5584 in this Hubble Space Telescope image. Thin, dark dust lanes appear to be flowing from the yellowish core, where older stars reside. The reddish dots sprinkled throughout the image are largely background galaxies. Among the galaxy's myriad stars are pulsating stars called Cepheid variables and one recent Type Ia supernova, a special class of exploding stars. Astronomers use Cepheid variables and Type Ia supernovae as reliable distance markers to measure the university's expansion rate. NGC 5584 was one of eight galaxies astronomers studied to measure the university's expansion rate. In those galaxies, astronomers analyzed more than 600 Cepheid variables, including 250 in NGC 5584. Cepheid variables pulsate at a rate matched closely by their intrinsic brightness, making them ideal for measuring distances to relatively nearby galaxies. Type Ia supernovae flare with the same brightness and are brilliant enough to be seen from relatively longer distances. Astronomers search for Type Ia supernovae in nearby galaxies containing Cepheid variables so they can compare true brightness of both types of stars. They then use that information to calibrate the measurement of Type Ia supernovae in far - flung galaxies and calculate their distance from Earth. Once astronomers know accurate distances to galaxies near and far, they can determine the university's expansion rate. The image is a composite of several exposures taken in visible light between January and April 2010 with Hubble's Wide Field Camera 3. NGC 5584 residues 72 mi — Spiral galaxy NGC 5584 - Spiral galaxy NGC 5584 - NGC 5584 is located 72 million light years from Earth in the constellation Virgin. This galaxy is home to many Cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Image obtained by the Hubble Space Telescope. The brilliant, blue glow of young stars traces the graceful spiral arms of galaxy NGC 5584 in this Hubble Space Telescope image. Thin, dark dust lanes appear to be flowing from the yellowish core, where older stars reside. The reddish dots sprinkled throughout the image are largely background galaxies. Among the galaxy's myriad stars are pulsating stars called Cepheid variables and one recent Type Ia supernova, a special class of exploding stars. Astronomers use Cepheid variables and Type Ia supernovae as reliable distance markers to measure the university's expansion rate. NGC 5584 was one of eight galaxies astronomers studied to measure the university

Spiral galaxy NGC 5584 - Spiral galaxy NGC 5584 - NGC 5584 is located 72 million light years from Earth in the constellation Virgin. This galaxy is home to many Cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Image obtained by the Hubble Space Telescope. The brilliant, blue glow of young stars traces the graceful spiral arms of galaxy NGC 5584 in this Hubble Space Telescope image. Thin, dark dust lanes appear to be flowing from the yellowish core, where older stars reside. The reddish dots sprinkled throughout the image are largely background galaxies. Among the galaxy's myriad stars are pulsating stars called Cepheid variables and one recent Type Ia supernova, a special class of exploding stars. Astronomers use Cepheid variables and Type Ia supernovae as reliable distance markers to measure the university's expansion rate. NGC 5584 was one of eight galaxies astronomers studied to measure the university

PIX4612766

Centaur Omega globular cluster - NGC 5139 Omega Centauri globular cluster - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centaur contains several million stars and is one of the oldest objects in our galaxy. One of the richest in the Milky Way, Omega Cen contains several million stars, but unlike its southern rival, 47 Tucanae, it has a relatively open structure. Like most galactic globular clusters, the stellar population of Omega Cen identifies it as one of the oldest objects associated with the Milky Way, indeed its age is comparable to that of the Universe itself. The cluster contains a large number of RR Lyrae variable stars which enable its distance to be determined as 17,000 light years

Centaur Omega globular cluster - NGC 5139 Omega Centauri globular cluster - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centaur contains several million stars and is one of the oldest objects in our galaxy. One of the richest in the Milky Way, Omega Cen contains several million stars, but unlike its southern rival, 47 Tucanae, it has a relatively open structure. Like most galactic globular clusters, the stellar population of Omega Cen identifies it as one of the oldest objects associated with the Milky Way, indeed its age is comparable to that of the Universe itself. The cluster contains a large number of RR Lyrae variable stars which enable its distance to be determined as 17,000 light years

PIX4564453

Nebula IC 405, star AE Aurigae in the Coach - Nebula IC 405 and runaway star AE Aurigae - IC 405, is a nebula illuminated by the massive star AE Aurigae. This type O star is a “” fleeing star”, a star ejected from the Orion nebula about 2.5 million years ago and continues its race at a speed of 200 km per second. The Flaming Star Nebula, IC 405, surrounds the variable star AE Aurigae. AE Aurigae is normally a 5.96 magnitude star of spectral class O. The star AE Aurigae itself is very bright, young, blue, and known as a runaway star since it appears to have been ejected from the Orion Nebula region about 2.5 million years ago

Nebula IC 405, star AE Aurigae in the Coach - Nebula IC 405 and runaway star AE Aurigae - IC 405, is a nebula illuminated by the massive star AE Aurigae. This type O star is a “” fleeing star”, a star ejected from the Orion nebula about 2.5 million years ago and continues its race at a speed of 200 km per second. The Flaming Star Nebula, IC 405, surrounds the variable star AE Aurigae. AE Aurigae is normally a 5.96 magnitude star of spectral class O. The star AE Aurigae itself is very bright, young, blue, and known as a runaway star since it appears to have been ejected from the Orion Nebula region about 2.5 million years ago

Adam Block

PIX4621903

Around Baade's window - Around Baade's window - Stars field to the center of our galaxy. The bright star at the bottom of the image is Gamma of Sagittarius. The globular cluster in the center of the image is NGC 6522. Image obtained from the 1.2m Schmidt UK telescope of Siding Spring. The German - American astronomer Walter Baade selected for study a region of the crowded star fields in Sagittarius where he believed the Galactic dust obscuration was both uniform and minimal. He used this line of sight to establish the distance of the unseen Galactic centre, using variable stars as his yardstick. He found it to be about 30,000 light years away. This part of the sky, around the globular cluster NGC 6522, is now known as Baade's window. The brightest star in the photograph is gamma Sagittarii, a deep yellow, naked eye star of about third magnitude. It is in the foreground at a distance of about 100 light years

Around Baade's window - Around Baade's window - Stars field to the center of our galaxy. The bright star at the bottom of the image is Gamma of Sagittarius. The globular cluster in the center of the image is NGC 6522. Image obtained from the 1.2m Schmidt UK telescope of Siding Spring. The German - American astronomer Walter Baade selected for study a region of the crowded star fields in Sagittarius where he believed the Galactic dust obscuration was both uniform and minimal. He used this line of sight to establish the distance of the unseen Galactic centre, using variable stars as his yardstick. He found it to be about 30,000 light years away. This part of the sky, around the globular cluster NGC 6522, is now known as Baade's window. The brightest star in the photograph is gamma Sagittarii, a deep yellow, naked eye star of about third magnitude. It is in the foreground at a distance of about 100 light years

PIX4564878

Centaur Omega globular cluster - The globular cluster Omega Centauri NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the oldest objects in our galaxy. To the unaided eye this glorious globular cluster has the appearance of a hazy star and was frequently confused with Halley's comet when it drifted through Centaurus in 1986. One of the richest in the Milky Way, Omega Cen contains several million stars, but unlike its southern rival, 47 Tucanae, it has a relatively open structure. Like most galactic globular clusters, the stellar population of Omega Cen identifies it as one of the oldest objects associated with the Milky Way, indeed its age is comparable to that of the Universe itself. The cluster contains a large number of RR Lyrae variable stars which enable its distance to be determined as 17,000 light years

Centaur Omega globular cluster - The globular cluster Omega Centauri NGC 5139 - Located 17,000 years ago - light from Earth in the southern constellation of Centaur, Omega Centauri contains several million stars and is one of the oldest objects in our galaxy. To the unaided eye this glorious globular cluster has the appearance of a hazy star and was frequently confused with Halley's comet when it drifted through Centaurus in 1986. One of the richest in the Milky Way, Omega Cen contains several million stars, but unlike its southern rival, 47 Tucanae, it has a relatively open structure. Like most galactic globular clusters, the stellar population of Omega Cen identifies it as one of the oldest objects associated with the Milky Way, indeed its age is comparable to that of the Universe itself. The cluster contains a large number of RR Lyrae variable stars which enable its distance to be determined as 17,000 light years

PIX4564400

U Geminorum in the sky of an exoplanet - U Geminorum seen from an exoplanet. Artwork - U Geminorum is a dwarf nova, a variable star composed of a white dwarf orbiting around a red dwarf. This binary greenhouse system is represented here in the sky of an extrasolar planet. Artwork showing U Geminorum in the sky of an exoplanet. U Geminorum, in the constellation Gemini, is an archetypal example of a dwarf nova. The binary star system consists of a white dwarf closely orbiting a red dwarf

U Geminorum in the sky of an exoplanet - U Geminorum seen from an exoplanet. Artwork - U Geminorum is a dwarf nova, a variable star composed of a white dwarf orbiting around a red dwarf. This binary greenhouse system is represented here in the sky of an extrasolar planet. Artwork showing U Geminorum in the sky of an exoplanet. U Geminorum, in the constellation Gemini, is an archetypal example of a dwarf nova. The binary star system consists of a white dwarf closely orbiting a red dwarf

Miller, Ron (b.1947)

PIX4574280

Cephee Constellation - Constellation of Cepheus - At the bottom left, the constellation Cassiopee; at the top, the bright star is the polar star. Cepheus is a representation of King Cepheus of Ethiopia, who has stellar connections, being husband to Cassiopeia and the father of Andromeda. It is a large northern constellation of 588 square degrees, 27th out of 88 in size and is best seen in the early evening in November. It is distinguished by having two unusual stars that are easily seen. Delta Cephei is the prototype for an intrinsically bright class of regularly pulsating variable stars whose period of variability is closely related to their absolute magnitudes. The brightest stars have the longest period, so distance can be estimated by measuring the period and the apparent magnitude of a star. And these stars are bright, so the method can be extended to nearby galaxies. Mu (u) Cephei is an extremely red, irregular variable star easily seen in binoculars. This too is a prototype, of a class of stars known as semi - regular variables — Cephee Constellation - Constellation of Cepheus - At the bottom left, the constellation Cassiopee; at the top, the bright star is the polar star. Cepheus is a representation of King Cepheus of Ethiopia, who has stellar connections, being husband to Cassiopeia and the father of Andromeda. It is a large northern constellation of 588 square degrees, 27th out of 88 in size and is best seen in the early evening in November. It is distinguished by having two unusual stars that are easily seen. Delta Cephei is the prototype for an intrinsically bright class of regularly pulsating variable stars whose period of variability is closely related to their absolute magnitudes. The brightest stars have the longest period, so distance can be estimated by measuring the period and the apparent magnitude of a star. And these stars are bright, so the method can be extended to nearby galaxies. Mu (u) Cephei is an extremely red, irregular variable star easily seen in binoculars. This too is a prototype, of

Cephee Constellation - Constellation of Cepheus - At the bottom left, the constellation Cassiopee; at the top, the bright star is the polar star. Cepheus is a representation of King Cepheus of Ethiopia, who has stellar connections, being husband to Cassiopeia and the father of Andromeda. It is a large northern constellation of 588 square degrees, 27th out of 88 in size and is best seen in the early evening in November. It is distinguished by having two unusual stars that are easily seen. Delta Cephei is the prototype for an intrinsically bright class of regularly pulsating variable stars whose period of variability is closely related to their absolute magnitudes. The brightest stars have the longest period, so distance can be estimated by measuring the period and the apparent magnitude of a star. And these stars are bright, so the method can be extended to nearby galaxies. Mu (u) Cephei is an extremely red, irregular variable star easily seen in binoculars. This too is a prototype, of

PIX4589805

Spiral Galaxy NGC 4603 in Centaur - Cepheids in the galaxy NGC 4603 - The spiral galaxy NGC 4603 is located 108 million years - light. Its distance was accurately measured by the Hubble space telescope in 1999 using the study of cepheides, variable stars. More than 36 cepheides have been identified in this galaxy. The bright stars visible in this image are located in front of the galaxy and belong to our lactee path. NGC 4603, a galaxy is 108 million light - years away. Its distance has been accurately measured by astronomers using the pulsating variable stars known as Cepheids. The Hubble space telescope has identified more than 36 Cepheids in NGC 4603. The bright stars visible on this image are in foreground and belong to our galaxy

Spiral Galaxy NGC 4603 in Centaur - Cepheids in the galaxy NGC 4603 - The spiral galaxy NGC 4603 is located 108 million years - light. Its distance was accurately measured by the Hubble space telescope in 1999 using the study of cepheides, variable stars. More than 36 cepheides have been identified in this galaxy. The bright stars visible in this image are located in front of the galaxy and belong to our lactee path. NGC 4603, a galaxy is 108 million light - years away. Its distance has been accurately measured by astronomers using the pulsating variable stars known as Cepheids. The Hubble space telescope has identified more than 36 Cepheids in NGC 4603. The bright stars visible on this image are in foreground and belong to our galaxy

PIX4611662

Nebulae around the cluster NGC 2264 and the nebula of the Cone - Wide field around NGC 2264 in Monoceros - Region of star formation located in the constellation of Unicorn about 2700 years old - light from Earth. Image obtained by the Oschin telescope of Mount Palomar through several filters and composed. Wide field around the open cluster NGC 2264 with the brilliant star S Monocerotis (center of the image) and Cone nebula. Image made from 2 different photographic plates taken at Palomar Observatory between 1989 and 1992

Nebulae around the cluster NGC 2264 and the nebula of the Cone - Wide field around NGC 2264 in Monoceros - Region of star formation located in the constellation of Unicorn about 2700 years old - light from Earth. Image obtained by the Oschin telescope of Mount Palomar through several filters and composed. Wide field around the open cluster NGC 2264 with the brilliant star S Monocerotis (center of the image) and Cone nebula. Image made from 2 different photographic plates taken at Palomar Observatory between 1989 and 1992

D. De Martin

PIX4618751

NGC 2264, S Monocerotis, Hubble Nebula and Trumpler 5 clusters - NGC 2261, 2264, the Cone nebula and Trumpler 5 - The Cone nebula on the left is a region H II located about 2600 years - light from Earth. The bright star on the top left is S Monocerotis, a star of magnitude 4.7. On the right, an open cluster of stars, Trumpler 5. Downstairs in the center, the Hubble nebula. Image obtained from the 1.2m Schmidt telescope of Siding Spring. The western end of the large constellation of Monoceros crossed by the Galactic plane and so is rich in the ingredients of star formation. Only five degrees south (not shown) is the beautiful Rosette nebula, also close to the Galactic plane. To the east (left) is the outline of the dark Cone nebula with its distinctive bright tip, apparently pointing to the star S Mon at the top (north) of the photograph. All around is faint nebulosity, hinting at star formation in the region. Around the dusty red nebula there are areas where the light from background stars is blocked out by dust which is unlit. At the lower center of the picture is Hubble's variable nebula (NGC 2261), a young star in a dusty cocoon, while at right is a large, old, open cluster of stars, Trumpler 5 — NGC 2264, S Monocerotis, Hubble Nebula and Trumpler 5 clusters - NGC 2261, 2264, the Cone nebula and Trumpler 5 - The Cone nebula on the left is a region H II located about 2600 years - light from Earth. The bright star on the top left is S Monocerotis, a star of magnitude 4.7. On the right, an open cluster of stars, Trumpler 5. Downstairs in the center, the Hubble nebula. Image obtained from the 1.2m Schmidt telescope of Siding Spring. The western end of the large constellation of Monoceros crossed by the Galactic plane and so is rich in the ingredients of star formation. Only five degrees south (not shown) is the beautiful Rosette nebula, also close to the Galactic plane. To the east (left) is the outline of the dark Cone nebula with its distinctive bright tip, apparently pointing to the star S Mon at the top (north) of the photograph. All around is faint nebulosity, hinting at star formation in the region. Around the dusty red nebula there are areas where the light from background s

NGC 2264, S Monocerotis, Hubble Nebula and Trumpler 5 clusters - NGC 2261, 2264, the Cone nebula and Trumpler 5 - The Cone nebula on the left is a region H II located about 2600 years - light from Earth. The bright star on the top left is S Monocerotis, a star of magnitude 4.7. On the right, an open cluster of stars, Trumpler 5. Downstairs in the center, the Hubble nebula. Image obtained from the 1.2m Schmidt telescope of Siding Spring. The western end of the large constellation of Monoceros crossed by the Galactic plane and so is rich in the ingredients of star formation. Only five degrees south (not shown) is the beautiful Rosette nebula, also close to the Galactic plane. To the east (left) is the outline of the dark Cone nebula with its distinctive bright tip, apparently pointing to the star S Mon at the top (north) of the photograph. All around is faint nebulosity, hinting at star formation in the region. Around the dusty red nebula there are areas where the light from background s

PIX4618768

Dark Stars and Nebulae in Sagittarius - The Star Clouds of Sagittarius - Star Field towards the center of our galaxy. The bright star towards the center of the image is Gamma of Sagittarius. Image obtained from the 1.2m Schmidt UK telescope of Siding Spring. Orbiting round the centre of our Galaxy are found huge numbers of stars which are mostly faint, cool and often billions of years old. They are as ancient as the Galaxy itself. These stars are seen with the unaided eye as the hazy star clouds of the southern Milky Way, especially rich in Sagittarius. Our line of sight in this direction is strongly affected by dust, which reveals itself by both dimming the starlight passing through it and by selectively removing the blue light, changing the apparent colour to a deeper yellow. Though the colour change is only seen in photographs such as this, the dustiness of the Milky Way is obvious to the unaided eye. Near the centre of the picture is a region known as Baade's Window after the astronomer who selected this part of the Milky Way for special study — Dark Stars and Nebulae in Sagittarius - The Star Clouds of Sagittarius - Star Field towards the center of our galaxy. The bright star towards the center of the image is Gamma of Sagittarius. Image obtained from the 1.2m Schmidt UK telescope of Siding Spring. Orbiting round the centre of our Galaxy are found huge numbers of stars which are mostly faint, cool and often billions of years old. They are as ancient as the Galaxy itself. These stars are seen with the unaided eye as the hazy star clouds of the southern Milky Way, especially rich in Sagittarius. Our line of sight in this direction is strongly affected by dust, which reveals itself by both dimming the starlight passing through it and by selectively removing the blue light, changing the apparent colour to a deeper yellow. Though the colour change is only seen in photographs such as this, the dustiness of the Milky Way is obvious to the unaided eye. Near the centre of the picture is a region known as Baade's Window after the astro

Dark Stars and Nebulae in Sagittarius - The Star Clouds of Sagittarius - Star Field towards the center of our galaxy. The bright star towards the center of the image is Gamma of Sagittarius. Image obtained from the 1.2m Schmidt UK telescope of Siding Spring. Orbiting round the centre of our Galaxy are found huge numbers of stars which are mostly faint, cool and often billions of years old. They are as ancient as the Galaxy itself. These stars are seen with the unaided eye as the hazy star clouds of the southern Milky Way, especially rich in Sagittarius. Our line of sight in this direction is strongly affected by dust, which reveals itself by both dimming the starlight passing through it and by selectively removing the blue light, changing the apparent colour to a deeper yellow. Though the colour change is only seen in photographs such as this, the dustiness of the Milky Way is obvious to the unaided eye. Near the centre of the picture is a region known as Baade's Window after the astro

PIX4621371

Artist's view of Algol, a binary star has eclipse - Binary system Algol - Artist vie

Artist's view of Algol, a binary star has eclipse - Binary system Algol - Artist vie

Dixon, Don (b.1951)

PIX4572650

Artist view of Algol, une star binaire a eclipse - Binary system Algol - Artist view - Binary stars exchange atmospheres in complex interplay of gravity and solar winds

Artist view of Algol, une star binaire a eclipse - Binary system Algol - Artist view - Binary stars exchange atmospheres in complex interplay of gravity and solar winds

Dixon, Don (b.1951)

PIX4572627

Artist's view of an eruptive star - Flare star. Artwork - An eruptive star is a variable star that can manifest a dramatic and imforeseeable increase in luminosite from a few minutes to a few hours. From X-rays to radios, the spectrum increases in intensity. Eruptive stars are red dwarves, although recent research indicates that brown dwarves may also be capable of eruptions. A flare star is a variable star which can undergo unpredictable dramatic increases in brightness for a few minutes or a few hours. The brightness increase is across the spectrum, from X - rays to radio waves. Flare stars are dim red dwarfs, although recent research indicates that brown dwarfs might also be capable of flaring

Artist's view of an eruptive star - Flare star. Artwork - An eruptive star is a variable star that can manifest a dramatic and imforeseeable increase in luminosite from a few minutes to a few hours. From X-rays to radios, the spectrum increases in intensity. Eruptive stars are red dwarves, although recent research indicates that brown dwarves may also be capable of eruptions. A flare star is a variable star which can undergo unpredictable dramatic increases in brightness for a few minutes or a few hours. The brightness increase is across the spectrum, from X - rays to radio waves. Flare stars are dim red dwarfs, although recent research indicates that brown dwarfs might also be capable of flaring

Dixon, Don (b.1951)

PIX4572699

Vue d'artiste d'une cepheide - Cepheid - artist view - Vue d'artiste d'une cepheide. Cepheides are very bright variable stars that serve as cosmic beacons to measure the distance of nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. A Cepheid variable star pulses in a regular period that is directly related to its intrinsic brightness, allowing astronomers to use such stars as “” standard candles”” to measure distances to other galaxies

Vue d'artiste d'une cepheide - Cepheid - artist view - Vue d'artiste d'une cepheide. Cepheides are very bright variable stars that serve as cosmic beacons to measure the distance of nearby galaxies. Their pulse period is measured and their absolute luminosite is calculated. By comparing the result to their apparent luminosite in the sky, they can be calculated accurately. A Cepheid variable star pulses in a regular period that is directly related to its intrinsic brightness, allowing astronomers to use such stars as “” standard candles”” to measure distances to other galaxies

Dixon, Don (b.1951)

PIX4572673

Exoplanete around Beta Lyrae - Artist view - Beta Lyrae - Artist view - Artist view of Beta Lyrae (Sheliak), a binary star with eclipse located in the constellation of Lyra. Gases spiral away from a binary star

Exoplanete around Beta Lyrae - Artist view - Beta Lyrae - Artist view - Artist view of Beta Lyrae (Sheliak), a binary star with eclipse located in the constellation of Lyra. Gases spiral away from a binary star

Dixon, Don (b.1951)

PIX4572620

A sharp decease occurs in the light curve of the variable star system Algol each time the dimmer star eclipses the brighter one.

A sharp decease occurs in the light curve of the variable star system Algol each time the dimmer star eclipses the brighter one.

UIG532375

Hubble Nebula (NGC 2261) in Unicorn - NGC 2261, Hubble's variable nebula - The Hubble Nebula is a weak nebulosite that surrounds the star R Monocerotis (R Mon), the bright star at the bottom of the nebula. The mass of the star R Mon is about 10 times that of the sun. It is approximately 2600 light years away and is only 300,000 years old. Image obtained by Siding Spring's 3.9m telescope. Hubble's variable nebula is in Monoceros and was the first object to be photographed with the famous 200 inch Hale Telescope at Palomar in 1948. This curious object is a reflection nebula in which is embedded the star R Monocerotis. Variations in the appearance of the nebula were noted by the American astronomer Edwin Hubble in 1916. They are probably caused by opaque clouds of dust passing between the hidden star and the outskirts of the nebula we see, the moving shadows changing the apparent form of the glowing dust in an irregular way. This picture was made from three AAT plates taken over several years and subtle colour changes around the edge of the nebula are indications of the variability — Hubble Nebula (NGC 2261) in Unicorn - NGC 2261, Hubble's variable nebula - The Hubble Nebula is a weak nebulosite that surrounds the star R Monocerotis (R Mon), the bright star at the bottom of the nebula. The mass of the star R Mon is about 10 times that of the sun. It is approximately 2600 light years away and is only 300,000 years old. Image obtained by Siding Spring's 3.9m telescope. Hubble's variable nebula is in Monoceros and was the first object to be photographed with the famous 200 inch Hale Telescope at Palomar in 1948. This curious object is a reflection nebula in which is embedded the star R Monocerotis. Variations in the appearance of the nebula were noted by the American astronomer Edwin Hubble in 1916. They are probably caused by opaque clouds of dust passing between the hidden star and the outskirts of the nebula we see, the moving shadows changing the apparent form of the glowing dust in an irregular way. This picture was made from three AAT plates taken over several y

Hubble Nebula (NGC 2261) in Unicorn - NGC 2261, Hubble's variable nebula - The Hubble Nebula is a weak nebulosite that surrounds the star R Monocerotis (R Mon), the bright star at the bottom of the nebula. The mass of the star R Mon is about 10 times that of the sun. It is approximately 2600 light years away and is only 300,000 years old. Image obtained by Siding Spring's 3.9m telescope. Hubble's variable nebula is in Monoceros and was the first object to be photographed with the famous 200 inch Hale Telescope at Palomar in 1948. This curious object is a reflection nebula in which is embedded the star R Monocerotis. Variations in the appearance of the nebula were noted by the American astronomer Edwin Hubble in 1916. They are probably caused by opaque clouds of dust passing between the hidden star and the outskirts of the nebula we see, the moving shadows changing the apparent form of the glowing dust in an irregular way. This picture was made from three AAT plates taken over several y

PIX4618577

Detail of the nebula NGC 3372 in the Carene - Eta Carinae nebula detail - Detail of the nebula NGC 3372 near the star Eta Carinae (off field). Region of star formation. Image obtained by the Hubble Space Telescope in April 1999. The Hubble Space Telescope image reveals complex structure in the Carina Nebula (NGC 3372). The picture is dominated by a large, approximately circular feature, which is part of the Keyhole Nebula. This region, about 8000 light - years from Earth, is located adjacent to the famous explosive variable star Eta Carinae, which lies just outside the field of view towards the upper right. The Carina Nebula also contains several other stars that are among the hottest and most massive known, each about 10 times as hot, and 100 times as massive, as our Sun

Detail of the nebula NGC 3372 in the Carene - Eta Carinae nebula detail - Detail of the nebula NGC 3372 near the star Eta Carinae (off field). Region of star formation. Image obtained by the Hubble Space Telescope in April 1999. The Hubble Space Telescope image reveals complex structure in the Carina Nebula (NGC 3372). The picture is dominated by a large, approximately circular feature, which is part of the Keyhole Nebula. This region, about 8000 light - years from Earth, is located adjacent to the famous explosive variable star Eta Carinae, which lies just outside the field of view towards the upper right. The Carina Nebula also contains several other stars that are among the hottest and most massive known, each about 10 times as hot, and 100 times as massive, as our Sun

PIX4618927

Nebula NGC 3372 in the Carene - NGC 3372, Eta Carinae nebula - The nebula of the Carene is located about 8000 years - light from the Earth. It is home to many hot massive stars, including the star Eta Carinae in the centre of the nebula. This nebula is larger than the Great Nebula in Orion, but is not visible from most northern latitudes. It is a giant complex of emission and dark nebulae surrounding the unique variable star Eta Carinae, which scientists believe is the most massive and energetic star in the Milky Way galaxy. Located about 8,500 light years from the Earth, the star is about 100 times as massive as our own Sun, but produces 6 million times the light output. It was observed producing a remarkable burst of X - ray emissions that doubled its X - ray output in only four months. In the 1840's, Eta Carinae erupted visibly and was the second brightest star in the sky during this time

Nebula NGC 3372 in the Carene - NGC 3372, Eta Carinae nebula - The nebula of the Carene is located about 8000 years - light from the Earth. It is home to many hot massive stars, including the star Eta Carinae in the centre of the nebula. This nebula is larger than the Great Nebula in Orion, but is not visible from most northern latitudes. It is a giant complex of emission and dark nebulae surrounding the unique variable star Eta Carinae, which scientists believe is the most massive and energetic star in the Milky Way galaxy. Located about 8,500 light years from the Earth, the star is about 100 times as massive as our own Sun, but produces 6 million times the light output. It was observed producing a remarkable burst of X - ray emissions that doubled its X - ray output in only four months. In the 1840's, Eta Carinae erupted visibly and was the second brightest star in the sky during this time

Jerry Lodriguss

PIX4618875

Nebula around the star R Aquarii - R Aquarii and its peculiar nebula - This star is actually a binary system composed of a giant red star (in the center) and a white dwarf (invisible in this photo). Image obtained by Siding Spring's 3.9m telescope. The star at the centre of this unique nebula has been known to be variable since 1810. It has a period of a little over a year, but the brightness shifts are erratic, ranging from the threshold of naked eye visibility to about 200 times fainter. At the centre of the nebula is a symbiotic star, an interacting pair consisting of a red giant and white dwarf. The dwarf draws in material from the giant, occasionally ejecting the surplus as the strange loops seen in the colour picture. The white dwarf itself is invisible and the light from the red dwarf is truly red, perhaps because the whole system is embedded in very dusty nebula which absorbs what blue light there is

Nebula around the star R Aquarii - R Aquarii and its peculiar nebula - This star is actually a binary system composed of a giant red star (in the center) and a white dwarf (invisible in this photo). Image obtained by Siding Spring's 3.9m telescope. The star at the centre of this unique nebula has been known to be variable since 1810. It has a period of a little over a year, but the brightness shifts are erratic, ranging from the threshold of naked eye visibility to about 200 times fainter. At the centre of the nebula is a symbiotic star, an interacting pair consisting of a red giant and white dwarf. The dwarf draws in material from the giant, occasionally ejecting the surplus as the strange loops seen in the colour picture. The white dwarf itself is invisible and the light from the red dwarf is truly red, perhaps because the whole system is embedded in very dusty nebula which absorbs what blue light there is

PIX4571946

Planet forming around variable star KH 15D - This young star (to the right) of the constellation Unicorn is surrounded by a large disc of dust that eclipses it every 48 days and in which planets are forming

Planet forming around variable star KH 15D - This young star (to the right) of the constellation Unicorn is surrounded by a large disc of dust that eclipses it every 48 days and in which planets are forming

L. Bret

PIX4573380

Stars Field in the Peacock - Random star field in Pavo, near NGC 6477 - Towards the middle of the picture, the cluster of galaxies IC 4765. Image obtained by Schmidt UK 1.2m Telescope from Siding Spring The brightest star visible here is the magnitude 4.2 variable blue star lambda Pav, visible to the unaided eye in a dark sky, while the scattering of stars in the lower part of the picture are about a magnitude fainter and would be hard to see in all but the darkest conditions. Near middle of the image, the cluster of galaxies IC 4765

Stars Field in the Peacock - Random star field in Pavo, near NGC 6477 - Towards the middle of the picture, the cluster of galaxies IC 4765. Image obtained by Schmidt UK 1.2m Telescope from Siding Spring The brightest star visible here is the magnitude 4.2 variable blue star lambda Pav, visible to the unaided eye in a dark sky, while the scattering of stars in the lower part of the picture are about a magnitude fainter and would be hard to see in all but the darkest conditions. Near middle of the image, the cluster of galaxies IC 4765

PIX4572367

Heart of the nebula NGC 3372 in the Carene - Eta Carinae and the Keyhole Nebula - The nebula of the Carene is located about 7000 years - light from the Earth. It is home to many hot stars, including the star Eta Carinae visible in the centre left of the image. Eta Carinae is a supermassive star (100 to 150 times the mass of the Sun). Image obtained by Siding Spring's 3.9m telescope. This wonderfully complex region at the heart of the NGC 3372 nebula was first described in detail by Sir John Herschel in 1838. He saw the bright circular shell visible in the upper part of the picture extending to the south to form a keyhole - shaped nebula. This luminous outline is no longer seen and the southern extension appears only as a dark dust cloud. It seems that the curious, explosively variable star Eta Carinae has enveloped itself in a cocoon of obscuring matter in the years since Herschel's observations and light from the star is no longer able to illuminate the rim of the dust cloud. The nebula thrown off by eta Car in Herschel's time has grown to the tiny orange nebula seen to the left of the dust cloud and is known as the Homunculus nebula — Heart of the nebula NGC 3372 in the Carene - Eta Carinae and the Keyhole Nebula - The nebula of the Carene is located about 7000 years - light from the Earth. It is home to many hot stars, including the star Eta Carinae visible in the centre left of the image. Eta Carinae is a supermassive star (100 to 150 times the mass of the Sun). Image obtained by Siding Spring's 3.9m telescope. This wonderfully complex region at the heart of the NGC 3372 nebula was first described in detail by Sir John Herschel in 1838. He saw the bright circular shell visible in the upper part of the picture extending to the south to form a keyhole - shaped nebula. This luminous outline is no longer seen and the southern extension appears only as a dark dust cloud. It seems that the curious, explosively variable star Eta Carinae has enveloped itself in a cocoon of obscuring matter in the years since Herschel's observations and light from the star is no longer able to illuminate the rim of the dust cloud. The nebu

Heart of the nebula NGC 3372 in the Carene - Eta Carinae and the Keyhole Nebula - The nebula of the Carene is located about 7000 years - light from the Earth. It is home to many hot stars, including the star Eta Carinae visible in the centre left of the image. Eta Carinae is a supermassive star (100 to 150 times the mass of the Sun). Image obtained by Siding Spring's 3.9m telescope. This wonderfully complex region at the heart of the NGC 3372 nebula was first described in detail by Sir John Herschel in 1838. He saw the bright circular shell visible in the upper part of the picture extending to the south to form a keyhole - shaped nebula. This luminous outline is no longer seen and the southern extension appears only as a dark dust cloud. It seems that the curious, explosively variable star Eta Carinae has enveloped itself in a cocoon of obscuring matter in the years since Herschel's observations and light from the star is no longer able to illuminate the rim of the dust cloud. The nebu

PIX4618913

Spiral galaxy NGC 3370 in the Lion - Spiral galaxy NGC 3370 in Leo - The spiral galaxy NGC 3370 is located about 100 million years away - light from Earth. In November 1994, light emitting from a supernova type Ia, SN 1994ae, part of this galaxy, reached Earth. In this image taken by the Hubble space telescope in May 2003, this supernova is no longer detectable. On the other hand, the telescope was able to observe in this galaxy cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Many galaxies are visible in the background. The majestic dusty spiral, NGC 3370, looms in the foreground in this NASA Hubble Space Telescope image. Recent observations taken with the Advanced Camera for Surveys show intricate spiral arm structure spotted with hot areas of new star formation. In November 1994, the light of a supernova in nearby NGC 3370 reached Earth. This stellar outburst briefly outshone all of the tens of billions of other stars in its galaxy. Although supernovae are common, with one exploding every few seconds somewhere in the universe, this one was special. Designated SN 1994ae, this supernova was one of the nearest and best observed supernovae since the advent of modern, digital detectors. It resides 98 million light - years (30 megaparsecs) from Earth. The supernova was also a member of a special subclass of supernovae, the type Ia, the best tool astronomers have to chart the growth rate of the expanding universe. Other, fainter stars of known brightness can be observed in the same galaxy. These stellar “” standard candles”” are the Cepheid variable stars, which vary regularly in brightness with periods that are directly related to their intrinsic brightness, and thus allow the distance to the galaxy””” and the supernova””” to be determined directly — Spiral galaxy NGC 3370 in the Lion - Spiral galaxy NGC 3370 in Leo - The spiral galaxy NGC 3370 is located about 100 million years away - light from Earth. In November 1994, light emitting from a supernova type Ia, SN 1994ae, part of this galaxy, reached Earth. In this image taken by the Hubble space telescope in May 2003, this supernova is no longer detectable. On the other hand, the telescope was able to observe in this galaxy cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Many galaxies are visible in the background. The majestic dusty spiral, NGC 3370, looms in the foreground in this NASA Hubble Space Telescope image. Recent observations taken with the Advanced Camera for Surveys show intricate spiral arm structure spotted with hot areas of new star formation. In November 1994, the light of a supernova in nearby NGC 3370 reached Earth. This stellar outburst briefly outshone all of the tens of billio

Spiral galaxy NGC 3370 in the Lion - Spiral galaxy NGC 3370 in Leo - The spiral galaxy NGC 3370 is located about 100 million years away - light from Earth. In November 1994, light emitting from a supernova type Ia, SN 1994ae, part of this galaxy, reached Earth. In this image taken by the Hubble space telescope in May 2003, this supernova is no longer detectable. On the other hand, the telescope was able to observe in this galaxy cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Many galaxies are visible in the background. The majestic dusty spiral, NGC 3370, looms in the foreground in this NASA Hubble Space Telescope image. Recent observations taken with the Advanced Camera for Surveys show intricate spiral arm structure spotted with hot areas of new star formation. In November 1994, the light of a supernova in nearby NGC 3370 reached Earth. This stellar outburst briefly outshone all of the tens of billio

PIX4610684

Spiral galaxy NGC 6814 in the Eagle - Spiral Galaxy NGC 6814: NGC 6814 is a spiral galaxy located in the constellation Eagle. It is an active galaxy called Seyfert, which probably houses a black hole in its heart. Image obtained with the Hubble telescope - Spiral galaxy NGC 6814 seen by Hubble Space Telescope. NGC 6814 has an extremely bright nucleus, a telltale sign that the galaxy is a Seyfert galaxy. These galaxies have very active centres that can emit strong bursts of radiation. The luminous heart of NGC 6814 is a highly variable source of X-ray radiation, causing scientists to suspect that it hosts a supermassive black hole with a mass about 18 million times that of the Sun. As NGC 6814 is a very active galaxy, many regions of ionised gas are studded along its spiral arms. In these large clouds of gas, a burst of star formation has recently taken place, forging the brilliant blue stars that are visible scattered throughout the galaxy

Spiral galaxy NGC 6814 in the Eagle - Spiral Galaxy NGC 6814: NGC 6814 is a spiral galaxy located in the constellation Eagle. It is an active galaxy called Seyfert, which probably houses a black hole in its heart. Image obtained with the Hubble telescope - Spiral galaxy NGC 6814 seen by Hubble Space Telescope. NGC 6814 has an extremely bright nucleus, a telltale sign that the galaxy is a Seyfert galaxy. These galaxies have very active centres that can emit strong bursts of radiation. The luminous heart of NGC 6814 is a highly variable source of X-ray radiation, causing scientists to suspect that it hosts a supermassive black hole with a mass about 18 million times that of the Sun. As NGC 6814 is a very active galaxy, many regions of ionised gas are studded along its spiral arms. In these large clouds of gas, a burst of star formation has recently taken place, forging the brilliant blue stars that are visible scattered throughout the galaxy

PIX4613024

Spiral galaxy NGC 3370 in the Lion - Spiral galaxy NGC 3370 in Leo - The spiral galaxy NGC 3370 is located about 100 million years away - light from Earth. In November 1994, light emitting from a supernova type Ia, SN 1994ae, part of this galaxy, reached Earth. In this image taken by the Hubble space telescope in May 2003, this supernova is no longer detectable. On the other hand, the telescope was able to observe in this galaxy cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Many galaxies are visible in the background. The majestic dusty spiral, NGC 3370, looms in the foreground in this NASA Hubble Space Telescope image. Recent observations taken with the Advanced Camera for Surveys show intricate spiral arm structure spotted with hot areas of new star formation. In November 1994, the light of a supernova in nearby NGC 3370 reached Earth. This stellar outburst briefly outshone all of the tens of billions of other stars in its galaxy. Although supernovae are common, with one exploding every few seconds somewhere in the universe, this one was special. Designated SN 1994ae, this supernova was one of the nearest and best observed supernovae since the advent of modern, digital detectors. It resides 98 million light - years (30 megaparsecs) from Earth. The supernova was also a member of a special subclass of supernovae, the type Ia, the best tool astronomers have to chart the growth rate of the expanding universe. Other, fainter stars of known brightness can be observed in the same galaxy. These stellar “” standard candles”” are the Cepheid variable stars, which vary regularly in brightness with periods that are directly related to their intrinsic brightness, and thus allow the distance to the galaxy””” and the supernova””” to be determined directly — Spiral galaxy NGC 3370 in the Lion - Spiral galaxy NGC 3370 in Leo - The spiral galaxy NGC 3370 is located about 100 million years away - light from Earth. In November 1994, light emitting from a supernova type Ia, SN 1994ae, part of this galaxy, reached Earth. In this image taken by the Hubble space telescope in May 2003, this supernova is no longer detectable. On the other hand, the telescope was able to observe in this galaxy cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Many galaxies are visible in the background. The majestic dusty spiral, NGC 3370, looms in the foreground in this NASA Hubble Space Telescope image. Recent observations taken with the Advanced Camera for Surveys show intricate spiral arm structure spotted with hot areas of new star formation. In November 1994, the light of a supernova in nearby NGC 3370 reached Earth. This stellar outburst briefly outshone all of the tens of billio

Spiral galaxy NGC 3370 in the Lion - Spiral galaxy NGC 3370 in Leo - The spiral galaxy NGC 3370 is located about 100 million years away - light from Earth. In November 1994, light emitting from a supernova type Ia, SN 1994ae, part of this galaxy, reached Earth. In this image taken by the Hubble space telescope in May 2003, this supernova is no longer detectable. On the other hand, the telescope was able to observe in this galaxy cepheides, variable stars used to accurately measure distances in the universe and calculate the rate of expansion of the universe. Many galaxies are visible in the background. The majestic dusty spiral, NGC 3370, looms in the foreground in this NASA Hubble Space Telescope image. Recent observations taken with the Advanced Camera for Surveys show intricate spiral arm structure spotted with hot areas of new star formation. In November 1994, the light of a supernova in nearby NGC 3370 reached Earth. This stellar outburst briefly outshone all of the tens of billio

PIX4610713

Southern Crown Nebula - The tail of the CRA reflection nebula - R Coronae Australis is a region of star formations visible in the southern hemisphere. It is located about 500 light years away from Earth. On the right, the globular cluster NGC 6723, located 30 000 light years from Earth in Sagittarius. Image made with the 1.2m Telescope of Schmidt UK from Siding Spring. Corona Australis (the southern crown, CRA) is in the far southern sky but visible from the southern states of the USA. The constellation is small but distinctive. The conspicuous globular cluster NGC 6723 is at the western (right) edge of the photograph, but it is in Sagittarius, and is about 30,000 light years distant. Our picture is about 4.5 degrees across and the extremely faint Corona Australis nebula meanders along the Sgr - CRA border nebula in the same E - W direction. Almost all the nebulosity here is starlight, reflected from minute grains of dust, some of which gather into darker condensations ('molecular clouds'), blotting out the background stars. By far the largest and densest of the molecular clouds is at the western end of the picture, seen in more detail here. It is about a degree long, corresponding to eight light years at the 500ly distance of the nebula and is extremely opaque - - background stars are dimmed by an astonishing 35 magnitudes. However, not all is darkness, and the dusty cloud appears to be tipped by a pair of bright stars, embedded in bright reflection nebulae. The brightest of these is NGC 6726 - 27 and it contains both a visual binary and a variable star. Other wispy nebulae in the western part of the dark cloud betray the presence of young, hidden stars — Southern Crown Nebula - The tail of the CRA reflection nebula - R Coronae Australis is a region of star formations visible in the southern hemisphere. It is located about 500 light years away from Earth. On the right, the globular cluster NGC 6723, located 30 000 light years from Earth in Sagittarius. Image made with the 1.2m Telescope of Schmidt UK from Siding Spring. Corona Australis (the southern crown, CRA) is in the far southern sky but visible from the southern states of the USA. The constellation is small but distinctive. The conspicuous globular cluster NGC 6723 is at the western (right) edge of the photograph, but it is in Sagittarius, and is about 30,000 light years distant. Our picture is about 4.5 degrees across and the extremely faint Corona Australis nebula meanders along the Sgr - CRA border nebula in the same E - W direction. Almost all the nebulosity here is starlight, reflected from minute grains of dust, some of which gather into darker condensations ('molecular clou

Southern Crown Nebula - The tail of the CRA reflection nebula - R Coronae Australis is a region of star formations visible in the southern hemisphere. It is located about 500 light years away from Earth. On the right, the globular cluster NGC 6723, located 30 000 light years from Earth in Sagittarius. Image made with the 1.2m Telescope of Schmidt UK from Siding Spring. Corona Australis (the southern crown, CRA) is in the far southern sky but visible from the southern states of the USA. The constellation is small but distinctive. The conspicuous globular cluster NGC 6723 is at the western (right) edge of the photograph, but it is in Sagittarius, and is about 30,000 light years distant. Our picture is about 4.5 degrees across and the extremely faint Corona Australis nebula meanders along the Sgr - CRA border nebula in the same E - W direction. Almost all the nebulosity here is starlight, reflected from minute grains of dust, some of which gather into darker condensations ('molecular clou

PIX4620260

Planetary nebula NGC 2346 in Unicorn - The planetary nebula NGC 2346 - This nebula is located about 2000 years - light from Earth. A binary star resides in its center. Image obtained by the 3.9m telescope of Siding Spring NGC 2346 is a fine bipolar planetary nebula which is on the celestial equator in the constellation of Monoceros. It is bright and conspicuous and has been extensively studied. Among its most remarkable characteristics is its unusually cool central star, which is a 'spectroscopic binary'. The two components are identified by the effect of their movement around each other on the lines of their spectrum. The double star, which has a period of about 16 days, is also variable, probably due to dust in orbit around it. The dust itself is heated by the central star and so NGC 2346 is unusually bright in the infrared part of the spectrum

Planetary nebula NGC 2346 in Unicorn - The planetary nebula NGC 2346 - This nebula is located about 2000 years - light from Earth. A binary star resides in its center. Image obtained by the 3.9m telescope of Siding Spring NGC 2346 is a fine bipolar planetary nebula which is on the celestial equator in the constellation of Monoceros. It is bright and conspicuous and has been extensively studied. Among its most remarkable characteristics is its unusually cool central star, which is a 'spectroscopic binary'. The two components are identified by the effect of their movement around each other on the lines of their spectrum. The double star, which has a period of about 16 days, is also variable, probably due to dust in orbit around it. The dust itself is heated by the central star and so NGC 2346 is unusually bright in the infrared part of the spectrum

PIX4622952

Southern Crown Nebula - The Corona Australis nebula (NGC 6726 - 27 - 29) - R Coronae Australis is one of the closest and most intense star-forming regions; visible in the southern hemisphere, it is located about 500 years from Earth. R Coronae Australis is the star in the center of the image that illuminates a reddish nebula around it. Image obtained in Chile at the observatory of La Silla with the 2.2 meter MPG/ESO telescope. Image of R Coronae Australis region in the southern Milky Way, obtained with the Wide Field Imager (WFI) (camera) at the 2.2 - m MPG/ESO Telescope on La Silla (Chile). The R Coronae Australis complex of young stars and interstellar gas clouds is one of the nearest star - forming regions, at a distance of approx. 500 light - years from the Sun. It is seen in the southern constellation of that name (The “Southern Crown”). R Coronae Australis, the bright star from which the entire complex is named, is located at the center of the field and illuminates the reddish nebula around it. The bright star in the lower part, illuminating a somewhat bluer nebula, is known as TY Coronae Australis. The brightness of these two stars and several others in the same field is variable. They belong to the so - called “” T Tauri””” class, a type that is quite common in star - forming regions. T Tauri stars are in the early stages of stellar evolution and display various observable characteristics of this phase, e.g. emission at visible and infrared wavelengths due to the accretion of matter left over from their formation, as well as X - ray emission. The nebulosity seen in this picture is mostly due to reflection of the stellar light by small dust particles. The stars in the R Coronae Australis complex do not emit sufficient ultraviolet light to ionize a substantial fraction of the surrounding hydrogen, and thus cause this gas to glow. Also visible are so - called Herbig - Haro objects, dense clumps of gas ejected f — Southern Crown Nebula - The Corona Australis nebula (NGC 6726 - 27 - 29) - R Coronae Australis is one of the closest and most intense star-forming regions; visible in the southern hemisphere, it is located about 500 years from Earth. R Coronae Australis is the star in the center of the image that illuminates a reddish nebula around it. Image obtained in Chile at the observatory of La Silla with the 2.2 meter MPG/ESO telescope. Image of R Coronae Australis region in the southern Milky Way, obtained with the Wide Field Imager (WFI) (camera) at the 2.2 - m MPG/ESO Telescope on La Silla (Chile). The R Coronae Australis complex of young stars and interstellar gas clouds is one of the nearest star - forming regions, at a distance of approx. 500 light - years from the Sun. It is seen in the southern constellation of that name (The “Southern Crown”). R Coronae Australis, the bright star from which the entire complex is named, is located at the center of the field and illuminates the reddish ne

Southern Crown Nebula - The Corona Australis nebula (NGC 6726 - 27 - 29) - R Coronae Australis is one of the closest and most intense star-forming regions; visible in the southern hemisphere, it is located about 500 years from Earth. R Coronae Australis is the star in the center of the image that illuminates a reddish nebula around it. Image obtained in Chile at the observatory of La Silla with the 2.2 meter MPG/ESO telescope. Image of R Coronae Australis region in the southern Milky Way, obtained with the Wide Field Imager (WFI) (camera) at the 2.2 - m MPG/ESO Telescope on La Silla (Chile). The R Coronae Australis complex of young stars and interstellar gas clouds is one of the nearest star - forming regions, at a distance of approx. 500 light - years from the Sun. It is seen in the southern constellation of that name (The “Southern Crown”). R Coronae Australis, the bright star from which the entire complex is named, is located at the center of the field and illuminates the reddish ne

PIX4620317

Mira type red giant star

Mira type red giant star

Miller, Ron (b.1947)

PIX6425992

Spiral Galaxy M31 in Andromede - Detail - The southern arm of the Andromeda galaxy, M31 - View of the southern arm of the Andromede galaxy. Visible to the naked eye, the Andromede galaxy is located about 2 million years away from Earth. In this image obtained in La Palma, one of its two satellite galaxies is visible to the north-east: M32 (NGC 221). Also visible is the star cloud NGC 206, low centre, one of the largest star formations regions of our local group. Like the lactee path, the Andromede galaxy belongs to the local group, which consists of about thirty galaxies. M31 is the finest and nearest large spiral galaxy in the sky, about 2 million light years away. Despite its distance it can be seen as an elongated streak with the unaided eye in northern skies and in a large telescope under good conditions it is clearly resolved into stars and star - forming regions. This picture shows less than half the galaxy but the spiral structure, star clouds and dust lanes are evident. Also here is one of M31's close companions, the compact elliptical galaxy M32 (NGC 221), (top). M31 and its companions belong to the Local Group of about 30 galaxies that includes the Milky Way and M31 as its most massive members as well as the Magellanic Clouds. <BR>This picture is about half a degree across and is of the same region as the frontispiece in Hubble's famous book “” The Realm of the Nebulae”” (Harvard UP, 1936). In his illustration Hubble points out a Cepheid variable star, a globular cluster, a star cloud and open cluster as typical ingredients of a spiral galaxy. The star cloud is so conspicuous that it has its own New General Catalogue number, NGC 206 — Spiral Galaxy M31 in Andromede - Detail - The southern arm of the Andromeda galaxy, M31 - View of the southern arm of the Andromede galaxy. Visible to the naked eye, the Andromede galaxy is located about 2 million years away from Earth. In this image obtained in La Palma, one of its two satellite galaxies is visible to the north-east: M32 (NGC 221). Also visible is the star cloud NGC 206, low centre, one of the largest star formations regions of our local group. Like the lactee path, the Andromede galaxy belongs to the local group, which consists of about thirty galaxies. M31 is the finest and nearest large spiral galaxy in the sky, about 2 million light years away. Despite its distance it can be seen as an elongated streak with the unaided eye in northern skies and in a large telescope under good conditions it is clearly resolved into stars and star - forming regions. This picture shows less than half the galaxy but the spiral structure, star clouds and dust lanes are evident. Also he

Spiral Galaxy M31 in Andromede - Detail - The southern arm of the Andromeda galaxy, M31 - View of the southern arm of the Andromede galaxy. Visible to the naked eye, the Andromede galaxy is located about 2 million years away from Earth. In this image obtained in La Palma, one of its two satellite galaxies is visible to the north-east: M32 (NGC 221). Also visible is the star cloud NGC 206, low centre, one of the largest star formations regions of our local group. Like the lactee path, the Andromede galaxy belongs to the local group, which consists of about thirty galaxies. M31 is the finest and nearest large spiral galaxy in the sky, about 2 million light years away. Despite its distance it can be seen as an elongated streak with the unaided eye in northern skies and in a large telescope under good conditions it is clearly resolved into stars and star - forming regions. This picture shows less than half the galaxy but the spiral structure, star clouds and dust lanes are evident. Also he

PIX4608878

Globular cluster Hodge 11 - Globular cluster Hodge 11 - This cluster of stars is located about 160,000 years ago - light in the Big Magellan Cloud

Globular cluster Hodge 11 - Globular cluster Hodge 11 - This cluster of stars is located about 160,000 years ago - light in the Big Magellan Cloud

PIX4565244

The Hanger and Nebula SH2 - 83 - Coathanger and nebula SH2 - 83 in Vulpecula - The Hanger cluster or Brocchi cluster (left) is not a true cluster of stars but an asterism located in the constellation of Little Fox. Towards the center of the image, a small nebula emitted, Sh2 - 83. Little Fox Constellation. Brocchi's Cluster (also known as the Coathanger or Collinder 399) is an asterism located in the constellation Vulpecula. It was first described by the Persian astronomer Al Sufi in his Book of Fixed Stars in 964 and was independently rediscovered by Giovanni Hodierna in the seventeenth century. In the 1920s, D. F. Brocchi, an amateur astronomer and chart maker for the American Association of Variable Star Observers, created a map of this object for use in calibrating photometers. The asterism is made up of ten stars ranging from fifth to seventh magnitude which form the conspicuous Coathanger, a straight line of six stars with a “” hook””” of four stars on the south side. An additional thirty or so fainter stars are sometimes considered to be associated as well. Under a dark sky, Brocchi's Cluster can be seen with the naked eye as an unresolved patch of light; binoculars or a telescope at very low power are usually needed in order to view the “” coathanger””” asterism. It is best found by slowly sweeping across the Milky Way along an imaginary line from the bright star Altair towards the even brighter star Vega. About one third of the way toward Vega, the Coathanger should be spotted easily against a darker region of the Milky Way. The status of this group as a star cluster has changed in recent years. The main stars were cataloged as an open cluster by Per Collinder in 1931, and the group was considered to be a cluster for most of the twentieth century. Looking at a variety of criteria, however, a study in 1970 concluded that only six of the brightest stars formed an actual cluster. Several independent studies since 1998 have now determined that t — The Hanger and Nebula SH2 - 83 - Coathanger and nebula SH2 - 83 in Vulpecula - The Hanger cluster or Brocchi cluster (left) is not a true cluster of stars but an asterism located in the constellation of Little Fox. Towards the center of the image, a small nebula emitted, Sh2 - 83. Little Fox Constellation. Brocchi's Cluster (also known as the Coathanger or Collinder 399) is an asterism located in the constellation Vulpecula. It was first described by the Persian astronomer Al Sufi in his Book of Fixed Stars in 964 and was independently rediscovered by Giovanni Hodierna in the seventeenth century. In the 1920s, D. F. Brocchi, an amateur astronomer and chart maker for the American Association of Variable Star Observers, created a map of this object for use in calibrating photometers. The asterism is made up of ten stars ranging from fifth to seventh magnitude which form the conspicuous Coathanger, a straight line of six stars with a “” hook””” of four stars on the south side. An addition

The Hanger and Nebula SH2 - 83 - Coathanger and nebula SH2 - 83 in Vulpecula - The Hanger cluster or Brocchi cluster (left) is not a true cluster of stars but an asterism located in the constellation of Little Fox. Towards the center of the image, a small nebula emitted, Sh2 - 83. Little Fox Constellation. Brocchi's Cluster (also known as the Coathanger or Collinder 399) is an asterism located in the constellation Vulpecula. It was first described by the Persian astronomer Al Sufi in his Book of Fixed Stars in 964 and was independently rediscovered by Giovanni Hodierna in the seventeenth century. In the 1920s, D. F. Brocchi, an amateur astronomer and chart maker for the American Association of Variable Star Observers, created a map of this object for use in calibrating photometers. The asterism is made up of ten stars ranging from fifth to seventh magnitude which form the conspicuous Coathanger, a straight line of six stars with a “” hook””” of four stars on the south side. An addition

Tom Davis

PIX4620989

Aquarius Constellation - Constellation of Aquarius - Field around the Aquarius constelllation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best seen in the early evening in August

Aquarius Constellation - Constellation of Aquarius - Field around the Aquarius constelllation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best seen in the early evening in August

PIX4594337

Polaris System - Polaris is a triple system consisting of a supergiant star and two dwarf stars. It is a pulsating variable star, cepheide of low amplitude. This montage shows the polar star and constellations of the Little Bear and the Big Bear (left), Polaris A and his companion Polaris B seen by the Hubble Space Telescope (top right), and Polaris Ab photographed for the first time by the Hubble Space Telescope (bottom right). This sequence of images shows that the North Star, Polaris is really a triple star system. For the first time, the close companion of Polaris has been seen directly. The left frame shows Polaris's location very close to the position of Earth's north celestial pole in Ursa Minor (the Small Bear). The upper right image shows Polaris A and its distant companion Polaris B, as viewed by Hubble. They are separated by approximately 240 billion miles. Polaris B, the wide companion, is visible in small telescopes, and was first noticed by William Herschel in 1780. The close companion, Polaris Ab was known to exist from its gravitational tug on Polaris A, but has only been seen directly now using Hubble (lower right image). The companion is only 2 trillion miles from Polaris A. The triple system is 430 light - years away — Polaris System - Polaris is a triple system consisting of a supergiant star and two dwarf stars. It is a pulsating variable star, cepheide of low amplitude. This montage shows the polar star and constellations of the Little Bear and the Big Bear (left), Polaris A and his companion Polaris B seen by the Hubble Space Telescope (top right), and Polaris Ab photographed for the first time by the Hubble Space Telescope (bottom right). This sequence of images shows that the North Star, Polaris is really a triple star system. For the first time, the close companion of Polaris has been seen directly. The left frame shows Polaris's location very close to the position of Earth's north celestial pole in Ursa Minor (the Small Bear). The upper right image shows Polaris A and its distant companion Polaris B, as viewed by Hubble. They are separated by approximately 240 billion miles. Polaris B, the wide companion, is visible in small telescopes, and was first noticed by William Herschel in 1780. The c

Polaris System - Polaris is a triple system consisting of a supergiant star and two dwarf stars. It is a pulsating variable star, cepheide of low amplitude. This montage shows the polar star and constellations of the Little Bear and the Big Bear (left), Polaris A and his companion Polaris B seen by the Hubble Space Telescope (top right), and Polaris Ab photographed for the first time by the Hubble Space Telescope (bottom right). This sequence of images shows that the North Star, Polaris is really a triple star system. For the first time, the close companion of Polaris has been seen directly. The left frame shows Polaris's location very close to the position of Earth's north celestial pole in Ursa Minor (the Small Bear). The upper right image shows Polaris A and its distant companion Polaris B, as viewed by Hubble. They are separated by approximately 240 billion miles. Polaris B, the wide companion, is visible in small telescopes, and was first noticed by William Herschel in 1780. The c

PIX4572025

Remains of supernova IC 443 in the Gemels - Located about 5000 years ago - light from Earth, IC 443 is the rest of a supernova that exploded 30,000 years ago. The bright star on the left is Eta Geminorum (Propus), a variable star

Remains of supernova IC 443 in the Gemels - Located about 5000 years ago - light from Earth, IC 443 is the rest of a supernova that exploded 30,000 years ago. The bright star on the left is Eta Geminorum (Propus), a variable star

E Mouquet

PIX4582532

Aquarius Constellations, Capricorn, Austral Fish and Microscope - Constellations of Aquarius, Capricorn, Piscis Austrinus, Microscopium - Field around the Aquarius constellation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best seen in the early evening in August — Aquarius Constellations, Capricorn, Austral Fish and Microscope - Constellations of Aquarius, Capricorn, Piscis Austrinus, Microscopium - Field around the Aquarius constellation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best s

Aquarius Constellations, Capricorn, Austral Fish and Microscope - Constellations of Aquarius, Capricorn, Piscis Austrinus, Microscopium - Field around the Aquarius constellation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best s

PIX4594319

Aquarius Constellation - Constellation of Aquarius - Field around the Aquarius constelllation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best seen in the early evening in August

Aquarius Constellation - Constellation of Aquarius - Field around the Aquarius constelllation. The Helix planetary nebula appears as a red dot towards the center of the image. Aquarius (The Water Carrier) is a large but relatively insconspicuous southern zodiacal constellation and has an area of about 980 square degrees, which makes it the 10th largest. Its origins as a constellation can be traced back to Babylonian times and has usually been delineated as a figure pouring water from a jar in the general direction of Capricornus and Piscis Austrinus, themselves quite watery constellations. The Sun is in this part of the sky in February and March, following the Ecliptic. The constellation embraces many objects of telescopic interest, including the Helix nebula and the Mira - like variable star R Aquarii. Also notable are the globular clusters M2 (NGC 7089) and the Saturn planetary nebula NGC 7009. Best seen in the early evening in August

PIX4594347

A planisphere printed in white on a dark blue background, c.1900 (cardboard, gilt)

A planisphere printed in white on a dark blue background, c.1900 (cardboard, gilt)

Jaubert, Leon (19th century)

MMM7339847

The Gamma ray sky - The Gamma ray sky - Map of the whole sky seen in gamma rays by the Fermi Gamma-Ray Space Telescope (FGST) satellite from August 4 to October 30, 2008. The strongest sources of gamma radiation are legendeed here. All-sky image seen in gamma ray showing the glowing gas of the Milky Way, blinking pulsars, and galaxies billions of light-years away. The all-sky image released today shows us how the cosmos would look if our eyes could detect radiation 150 million times more energetic than visible light. The view merges Large Area Telescope (LAT) on Fermi Gamma-ray Space Telescope (FGST) observations spanning 87 days, from August 4 to October 30, 2008. The top five sources within our galaxy are: The sun. Now near the minimum of its activity cycle, the sun would not be a particularly notable source except for one thing: It's the only one that moves across the sky. The sun's annual motion against the background sky is a reflection of Earth's orbit around the sun. LSI+61 303. This is a high-mass X-ray binary located 6,500 light-years away in Cassiopeia. This unusual system contains a hot B-type star and a neutron star and produces radio outbursts that recur every 26.5 days. Astronomers cannot yet account for the energy that powers these emissions. PSR J1836+5925. This is a pulsar - a type of spinning neutron star that emits beams of radiation - located in the constellation Draco. It's one of the new breed of pulsars discovered by Fermi that pulse only in gamma rays. 47 Tucanae. Also known as NGC 104, this is a sphere of ancient stars called a globular cluster. It lies 15,000 light-years away in the southern constellation Tucana. Unidentified. More than 30 of the brightest gamma-ray sources Fermi sees have no obvious counterparts at other wavelengths. This one, designated 0FGL J1813.5-1248, was not seen by previous missions, and Fermi's LAT sees it as variable. The source lies near the plane of the Milky Way in the constellation Serpens Cauda. A — The Gamma ray sky - The Gamma ray sky - Map of the whole sky seen in gamma rays by the Fermi Gamma-Ray Space Telescope (FGST) satellite from August 4 to October 30, 2008. The strongest sources of gamma radiation are legendeed here. All-sky image seen in gamma ray showing the glowing gas of the Milky Way, blinking pulsars, and galaxies billions of light-years away. The all-sky image released today shows us how the cosmos would look if our eyes could detect radiation 150 million times more energetic than visible light. The view merges Large Area Telescope (LAT) on Fermi Gamma-ray Space Telescope (FGST) observations spanning 87 days, from August 4 to October 30, 2008. The top five sources within our galaxy are: The sun. Now near the minimum of its activity cycle, the sun would not be a particularly notable source except for one thing: It's the only one that moves across the sky. The sun's annual motion against the background sky is a reflection of Earth's orbit around the sun. LSI+61 303.

The Gamma ray sky - The Gamma ray sky - Map of the whole sky seen in gamma rays by the Fermi Gamma-Ray Space Telescope (FGST) satellite from August 4 to October 30, 2008. The strongest sources of gamma radiation are legendeed here. All-sky image seen in gamma ray showing the glowing gas of the Milky Way, blinking pulsars, and galaxies billions of light-years away. The all-sky image released today shows us how the cosmos would look if our eyes could detect radiation 150 million times more energetic than visible light. The view merges Large Area Telescope (LAT) on Fermi Gamma-ray Space Telescope (FGST) observations spanning 87 days, from August 4 to October 30, 2008. The top five sources within our galaxy are: The sun. Now near the minimum of its activity cycle, the sun would not be a particularly notable source except for one thing: It's the only one that moves across the sky. The sun's annual motion against the background sky is a reflection of Earth's orbit around the sun. LSI+61 303.

PIX4638007

Nebula M78 in Orion - M78 nebula in Orion - The reflexion nebula M78 (NGC 2068) is located about 1300 years - light from Earth and extends over 4 years - light. Image obtained with the 2.2 meter MPG/ESO telescope at the La Silla Observatory. Messier 78 is a fine example of a reflection nebula. The ultraviolet radiation from the stars that illuminate it is not intense enough to ionise the gas to make it glow - - its dust particles simply reflect the starlight that falls on them. Despite this, Messier 78 can easily be observed with a small telescope, being one of the brightest reflection nebulae in the sky. It lies about 1350 light - years away in the constellation of Orion (The Hunter) and can be found northeast of the easternmost star of Orion's belt. Two bright stars, HD 38563A and HD 38563B, are the main powerhouses behind Messier 78. However, the nebula is home to many more stars, including a collection of about 45 low mass, young stars (less than 10 million years old) in which the cores are still too cool for hydrogen fusion to start, known as T Tauri stars. Studying T Tauri stars is important for understanding the early stages of star formation and how planetary systems are created. Remarkably, this complex of nebulae has also changed significantly in the last ten years. In February 2004 the experienced amateur observer Jay McNeil took an image of this region with a 75 mm telescope and was surprised to see a bright nebula - - the prominent fan shaped feature near the bottom of this picture - - where nothing was seen on most earlier images. This object is now known as McNeil's Nebula and it appears to be a highly variable reflection nebula around a young star. Image taken with the MPG/ESO 2.2 - metre telescope at the La Silla Observatory — Nebula M78 in Orion - M78 nebula in Orion - The reflexion nebula M78 (NGC 2068) is located about 1300 years - light from Earth and extends over 4 years - light. Image obtained with the 2.2 meter MPG/ESO telescope at the La Silla Observatory. Messier 78 is a fine example of a reflection nebula. The ultraviolet radiation from the stars that illuminate it is not intense enough to ionise the gas to make it glow - - its dust particles simply reflect the starlight that falls on them. Despite this, Messier 78 can easily be observed with a small telescope, being one of the brightest reflection nebulae in the sky. It lies about 1350 light - years away in the constellation of Orion (The Hunter) and can be found northeast of the easternmost star of Orion's belt. Two bright stars, HD 38563A and HD 38563B, are the main powerhouses behind Messier 78. However, the nebula is home to many more stars, including a collection of about 45 low mass, young stars (less than 10 million years old) in which the

Nebula M78 in Orion - M78 nebula in Orion - The reflexion nebula M78 (NGC 2068) is located about 1300 years - light from Earth and extends over 4 years - light. Image obtained with the 2.2 meter MPG/ESO telescope at the La Silla Observatory. Messier 78 is a fine example of a reflection nebula. The ultraviolet radiation from the stars that illuminate it is not intense enough to ionise the gas to make it glow - - its dust particles simply reflect the starlight that falls on them. Despite this, Messier 78 can easily be observed with a small telescope, being one of the brightest reflection nebulae in the sky. It lies about 1350 light - years away in the constellation of Orion (The Hunter) and can be found northeast of the easternmost star of Orion's belt. Two bright stars, HD 38563A and HD 38563B, are the main powerhouses behind Messier 78. However, the nebula is home to many more stars, including a collection of about 45 low mass, young stars (less than 10 million years old) in which the

PIX4618217

Nebula NGC 6726 - 27 - 29 in the Southern Crown - The Corona Australis nebula (NGC 6726 - 27 - 29) Image of R Coronae Australis region in the southern Milky Way, obtained with the Wide Field Imager (WFI) (camera) at the 2.2 - m MPG/ESO Telescope on La Silla (Chile). The sky field shown measures approx. 33.7 x 31.9 arcmin2 (about the diameter of the full moon). The R Coronae Australis complex of young stars and interstellar gas clouds is one of the nearest star - forming regions, at a distance of approx. 500 light - years from the Sun. It is seen in the southern constellation of that name (The “Southern Crown”). R Coronae Australis, the bright star from which the entire complex is named, is located at the center of the field and illuminates the reddish nebula around it. The bright star in the lower part, illuminating a somewhat bluer nebula, is known as TY Coronae Australis. The brightness of these two stars and several others in the same field is variable. They belong to the so - called “” T Tauri””” class, a type that is quite common in star - forming regions. T Tauri stars are in the early stages of stellar evolution and display various observable characteristics of this phase, e.g. emission at visible and infrared wavelengths due to the accretion of matter left over from their formation, as well as X - ray emission. The nebulosity seen in this picture is mostly due to reflection of the stellar light by small dust particles. The stars in the R Coronae Australis complex do not emit sufficient ultraviolet light to ionize a substantial fraction of the surrounding hydrogen, and thus cause this gas to glow. Also visible are so - called Herbig - Haro objects, i.e., dense clumps of gas ejected from the immediate vicinity of newly formed stars with velocities of about 200 km/sec. The observations were obtained on the night of 30 August 2000 — Nebula NGC 6726 - 27 - 29 in the Southern Crown - The Corona Australis nebula (NGC 6726 - 27 - 29) Image of R Coronae Australis region in the southern Milky Way, obtained with the Wide Field Imager (WFI) (camera) at the 2.2 - m MPG/ESO Telescope on La Silla (Chile). The sky field shown measures approx. 33.7 x 31.9 arcmin2 (about the diameter of the full moon). The R Coronae Australis complex of young stars and interstellar gas clouds is one of the nearest star - forming regions, at a distance of approx. 500 light - years from the Sun. It is seen in the southern constellation of that name (The “Southern Crown”). R Coronae Australis, the bright star from which the entire complex is named, is located at the center of the field and illuminates the reddish nebula around it. The bright star in the lower part, illuminating a somewhat bluer nebula, is known as TY Coronae Australis. The brightness of these two stars and several others in the same field is variable. They belong to the so - calle

Nebula NGC 6726 - 27 - 29 in the Southern Crown - The Corona Australis nebula (NGC 6726 - 27 - 29) Image of R Coronae Australis region in the southern Milky Way, obtained with the Wide Field Imager (WFI) (camera) at the 2.2 - m MPG/ESO Telescope on La Silla (Chile). The sky field shown measures approx. 33.7 x 31.9 arcmin2 (about the diameter of the full moon). The R Coronae Australis complex of young stars and interstellar gas clouds is one of the nearest star - forming regions, at a distance of approx. 500 light - years from the Sun. It is seen in the southern constellation of that name (The “Southern Crown”). R Coronae Australis, the bright star from which the entire complex is named, is located at the center of the field and illuminates the reddish nebula around it. The bright star in the lower part, illuminating a somewhat bluer nebula, is known as TY Coronae Australis. The brightness of these two stars and several others in the same field is variable. They belong to the so - calle

PIX4620222

Nebula IC 1396 in Cephee - Nebula IC 1396 in Cephee - Nebula IC 1396 is a vast region of star formation between 2000 and 3000 years - Earth light. It houses several nebulae, including the elephant tube (VDB 142), towards the centre of the image, and several dark nebulae, including Barnard 161. A bright star is visible in this photo, Mu Cephei, a supergiant variable star

Nebula IC 1396 in Cephee - Nebula IC 1396 in Cephee - Nebula IC 1396 is a vast region of star formation between 2000 and 3000 years - Earth light. It houses several nebulae, including the elephant tube (VDB 142), towards the centre of the image, and several dark nebulae, including Barnard 161. A bright star is visible in this photo, Mu Cephei, a supergiant variable star

R. Gendler

PIX4622223

Crab Nebula and Star Zeta Tauri - This two - colour image shows 2.7 x 2.7 degrees of the surroundings around the Crab Nebula. It was composed from Digitized Sky Survey 2 images. z Tauri (zeta Tau) is a very bright, star, with a visual magnitude of 2.97. Is classified as a variable star, although its range of variability is very small. Represents the southern tip of the Horns of Taurus

Crab Nebula and Star Zeta Tauri - This two - colour image shows 2.7 x 2.7 degrees of the surroundings around the Crab Nebula. It was composed from Digitized Sky Survey 2 images. z Tauri (zeta Tau) is a very bright, star, with a visual magnitude of 2.97. Is classified as a variable star, although its range of variability is very small. Represents the southern tip of the Horns of Taurus

PIX4583026

Mick Jagger performs 'I Cant Turn You Loose' in the East Room of the White House, Feb. 21, 2012. Jagger was one of an all star concert broadcast by PBS, 'In Performance at the White House: Red, White and Blues'

Mick Jagger performs 'I Cant Turn You Loose' in the East Room of the White House, Feb. 21, 2012. Jagger was one of an all star concert broadcast by PBS, 'In Performance at the White House: Red, White and Blues'

EVB2947855

Supernova IC 443 remains in the Gemels - Supernova IC 443 remains in the Gemels - Located about 5000 years ago - light from Earth, IC 443 is the rest of a supernova that exploded 30,000 years ago. The bright star on the right is Eta Geminorum (Propus), a variable star. Image obtained by the Oschin telescope of Mount Palomar through several filters and composed

Supernova IC 443 remains in the Gemels - Supernova IC 443 remains in the Gemels - Located about 5000 years ago - light from Earth, IC 443 is the rest of a supernova that exploded 30,000 years ago. The bright star on the right is Eta Geminorum (Propus), a variable star. Image obtained by the Oschin telescope of Mount Palomar through several filters and composed

Vincent Toporenko

PIX4582523

Light and Shadow in the Carina Nebula, 2 March 2000

Light and Shadow in the Carina Nebula, 2 March 2000

UIS5093499

Polaris. Artwork

Polaris. Artwork

S. Numazawa

PIX5619655

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