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Images of 'Cepheid' found, 28

Constellation of Cephee - Constellation of Cepheu

Constellation of Cephee - Constellation of Cepheu

Jerry Lodriguss

PIX4589786

Spiral Galaxy NGC 925 in Triangle - Spiral galaxy NGC 925 in Triangulu

Spiral Galaxy NGC 925 in Triangle - Spiral galaxy NGC 925 in Triangulu

R. Gendler

PIX4609542

Spiral Galaxy NGC 925 in Triangle - Spiral galaxy NGC 925 in Triangulu

Spiral Galaxy NGC 925 in Triangle - Spiral galaxy NGC 925 in Triangulu

Jim Misti

PIX4609545

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

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 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

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

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

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

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

NGC 206 star cluster in the spiral galaxy M31 - Star cluster NGC 206 in the M31 spiral galaxy - The NGC 206 cluster, in the center of the image, is located in one of the arms south of the Andromede galaxy. It is one of the largest star-forming regions of our local group. This star cluster (blue, center of the image) is located in a southern arm of the Andromeda galaxy. It is great area of star formation

NGC 206 star cluster in the spiral galaxy M31 - Star cluster NGC 206 in the M31 spiral galaxy - The NGC 206 cluster, in the center of the image, is located in one of the arms south of the Andromede galaxy. It is one of the largest star-forming regions of our local group. This star cluster (blue, center of the image) is located in a southern arm of the Andromeda galaxy. It is great area of star formation

Jim Misti

PIX4567618

Cepheides in the barree spiral galaxy NGC 1365 - Cepheids in the barred spiral galaxy NGC 1365 - Detail on a star-forming zone in the barree spiral galaxy NGC 1365. Approximately 50 cepheides were discovered, allowing it to calculate its distance and estimate it at 60 million light years. NGC 1365 is a barred spiral galaxy that extends over 200,000 years - light. It belongs to the cluster of galaxies in the Furnace. Image obtained in 1996 by the Hubble space telescope A left image obtained by a ground telescope. This color image from the Hubble Space Telescope shows a region in NGC 1365, a barred spiral galaxy located in a cluster of galaxies called Fornax. A barred spiral galaxy is characterized by a “” bar””” of stars, dust and gas across its center. The black and white photograph from a ground - based telescope shows the entire galaxy, which is visible from the Southern Hemisphere. Astronomers who have been measuring the distance to the Fornax cluster, have estimated it to be 60 mil

Cepheides in the barree spiral galaxy NGC 1365 - Cepheids in the barred spiral galaxy NGC 1365 - Detail on a star-forming zone in the barree spiral galaxy NGC 1365. Approximately 50 cepheides were discovered, allowing it to calculate its distance and estimate it at 60 million light years. NGC 1365 is a barred spiral galaxy that extends over 200,000 years - light. It belongs to the cluster of galaxies in the Furnace. Image obtained in 1996 by the Hubble space telescope A left image obtained by a ground telescope. This color image from the Hubble Space Telescope shows a region in NGC 1365, a barred spiral galaxy located in a cluster of galaxies called Fornax. A barred spiral galaxy is characterized by a “” bar””” of stars, dust and gas across its center. The black and white photograph from a ground - based telescope shows the entire galaxy, which is visible from the Southern Hemisphere. Astronomers who have been measuring the distance to the Fornax cluster, have estimated it to be 60 mil

PIX4609849

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

NGC 206 star cluster in the spiral galaxy M31 - Star cluster NGC 206 in the M31 spiral galaxy - The NGC 206 cluster, in the center of the image, is located in one of the arms south of the Andromede galaxy. It is one of the largest star-forming regions of our local group. NGC 206, in the center of the image, is located in the southern arm of Andromeda Galaxy. It is one of the largest star forming region of our local group

NGC 206 star cluster in the spiral galaxy M31 - Star cluster NGC 206 in the M31 spiral galaxy - The NGC 206 cluster, in the center of the image, is located in one of the arms south of the Andromede galaxy. It is one of the largest star-forming regions of our local group. NGC 206, in the center of the image, is located in the southern arm of Andromeda Galaxy. It is one of the largest star forming region of our local group

R. Gendler

PIX4567601

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 1309 in Eridan - Spiral galaxy NGC 1309 in Eridanus - Located about 100 million years ago - light from Earth, NGC 1309 extends over 30,000 years - light in the constellation Eridan. A supernova and a few cepheides have been observed in this galaxy. Many galaxies are visible in the background. The image was taken in 2005 by the Hubble space Telescope. NGC 1309 is 100 million light - years (30 Megaparsecs) distant

Spiral galaxy NGC 1309 in Eridan - Spiral galaxy NGC 1309 in Eridanus - Located about 100 million years ago - light from Earth, NGC 1309 extends over 30,000 years - light in the constellation Eridan. A supernova and a few cepheides have been observed in this galaxy. Many galaxies are visible in the background. The image was taken in 2005 by the Hubble space Telescope. NGC 1309 is 100 million light - years (30 Megaparsecs) distant

PIX4609750

Galaxies M95 and M96 in the Lion - Galaxies M95 and M96 in Leo - M95 (NGC 3351), on the left, is a barree spiral of type SBB, M96 (NGC 3368), on the right, is a spiral galaxy of type Sa. M96 is the brightest member of the Leo I galaxy group, which is also called the M96 group. It also contains M95, M105 and a number of weaker galaxies. Their distance to our Sun was measured with great precision thanks to the discovery of cepheides in these galaxies and the appearance of a supernova of type Ia in M96 in May 1998. These two galaxies are located 37 million light years away from Earth. M95 (NGC 3351, left), is a barred spiral galaxy, M96 (NGC 3368, right), is a spiral galaxy. With M105 (not pictured here), they are dominant members of the Leo I galactic group which also includes several fainter galaxies. Their distance from our Sun has been determinated with great precision thanks to the discovery of Cepheids stars in these galaxies and a type IA supernova in M96 appeared in May 1998. Thei

Galaxies M95 and M96 in the Lion - Galaxies M95 and M96 in Leo - M95 (NGC 3351), on the left, is a barree spiral of type SBB, M96 (NGC 3368), on the right, is a spiral galaxy of type Sa. M96 is the brightest member of the Leo I galaxy group, which is also called the M96 group. It also contains M95, M105 and a number of weaker galaxies. Their distance to our Sun was measured with great precision thanks to the discovery of cepheides in these galaxies and the appearance of a supernova of type Ia in M96 in May 1998. These two galaxies are located 37 million light years away from Earth. M95 (NGC 3351, left), is a barred spiral galaxy, M96 (NGC 3368, right), is a spiral galaxy. With M105 (not pictured here), they are dominant members of the Leo I galactic group which also includes several fainter galaxies. Their distance from our Sun has been determinated with great precision thanks to the discovery of Cepheids stars in these galaxies and a type IA supernova in M96 appeared in May 1998. Thei

R. Gendler

PIX4610672

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

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

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 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

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

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

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

Variable Stars in a Distant Spiral Galaxy ,1999

Variable Stars in a Distant Spiral Galaxy ,1999

UIS5093523

Polaris. Artwork

Polaris. Artwork

S. Numazawa

PIX5619655

Spiral galaxy NGC 925 in Triangulu

Spiral galaxy NGC 925 in Triangulu

Adam Block

PIX5620116

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

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