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Images of 'Variable' found, 402

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Buckinghams Improved Variable Cut-Off Valve

Buckinghams Improved Variable Cut-Off Valve

UIG2902353

Variable Stars (chromolitho)

Variable Stars (chromolitho)

English School, (20th century)

LLM3651678

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

The Common Buzzard, 1739 (w/c and gouache on paper)

The Common Buzzard, 1739 (w/c and gouache on paper)

Collins, Charles (1680-1744)

CEC128156

Whale Constellation - Constellation of Cetu

Whale Constellation - Constellation of Cetu

PIX4589151

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

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

Constellation of Cephee - Constellation of Cepheu

Constellation of Cephee - Constellation of Cepheu

B&S.Fletcher

PIX4589809

Multi Role Combat Aircraft or MRCA

Multi Role Combat Aircraft or MRCA

Hardy, Wilf (Wilfred) (20th century)

LAL338039

Constellation of Cephee - Constellation of Cepheu

Constellation of Cephee - Constellation of Cepheu

Jerry Lodriguss

PIX4589786

USA, 1950s: Two white rats sat next to each other

USA, 1950s: Two white rats sat next to each other

AVE6322217

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

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

The Buzzard (Buteo buteo) plate from 'The British Zoology, Class II: Birds', engraved by Peter Mazell (fl.1761-97) 1766 (engraving)

The Buzzard (Buteo buteo) plate from 'The British Zoology, Class II: Birds', engraved by Peter Mazell (fl.1761-97) 1766 (engraving)

Collins, Charles (1660-1744) (after)

STC92689

Continuously variable transmission.

Continuously variable transmission.

UDK844594

Whale Constellation - Constellation of Cetu

Whale Constellation - Constellation of Cetu

PIX4589123

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

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 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

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

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

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

Variable Piece #101, 1973 (gelatin silver prints & typewritten sheet mounted on board)

Variable Piece #101, 1973 (gelatin silver prints & typewritten sheet mounted on board)

Huebler, Douglas (1924-97)

CH3576729

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

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 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

Sandstones

Sandstones

NHM1456452

Mountain Hare (coloured engraving)

Mountain Hare (coloured engraving)

German School, (19th century)

PRX1000358

Mountain Hare (coloured engraving)

Mountain Hare (coloured engraving)

German School, (19th century)

PRX1000347

Mountain Hare (coloured engraving)

Mountain Hare (coloured engraving)

German School, (19th century)

PRX1000357

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

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

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

Mountain Hare (coloured engraving)

Mountain Hare (coloured engraving)

German School, (19th century)

PRX1000356

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

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

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

Variable wheatear (Oenanthe picata), Engraving by John Gould

Variable wheatear (Oenanthe picata), Engraving by John Gould

Gould, John (1804-81)

DGA1140618

Tropical Sunbirds (gouache on paper)

Tropical Sunbirds (gouache on paper)

Chalkley, John (20th Century)

LAL288718

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

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 - 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

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

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

Accipiter novaehollandiae

Accipiter novaehollandiae

NHM1450771

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

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

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 - 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

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

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

Forsterygion varium

Forsterygion varium

NHM1457498

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

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

Decorative botanical print with banksia, caladium, bougainvillea and begonia

Decorative botanical print with banksia, caladium, bougainvillea and begonia

FLO5855562

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

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

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