APOOD - astronomy picture-overlay of the day

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APOOD - astronomy picture-overlay of the day syzygy 9/3/07 12:53 AM
hi all!
in this thread i will share overlays earned mainly from NASA-APOD page and SPACE.com.
the topic should be named as the sister of my earlier APOD - the best ever astronomy pics thread.
i am to put up overlays those are mean some improvement of the GSky imagery e.g.:

hope you will like it!

hi-res image overlays!
be patient when download!

making easier to pick one:

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The Colorful Clouds of Rho Ophiuchi syzygy 9/3/07 12:57 AM

Credit: Adam Block, KPNO Visitor Program, NOAO, AURA, NSF

Explanation: The many spectacular colors of the Rho Ophiuchi (oh'-fee-yu-kee) clouds highlight the many processes that occur there. The blue regions shine primarily by reflected light. Blue light from the star Rho Ophiuchi and nearby stars reflects more efficiently off this portion of the nebula than red light. The Earth's daytime sky appears blue for the same reason. The red and yellow regions shine primarily because of emission from the nebula's atomic and molecular gas. Light from nearby blue stars - more energetic than the bright star Antares - knocks electrons away from the gas, which then shines when the electrons recombine with the gas. The dark regions are caused by dust grains - born in young stellar atmospheres - which effectively block light emitted behind them. The Rho Ophiuchi star clouds, well in front of the globular cluster M4 visible above on far lower left, are even more colorful than humans can see - the clouds emits light in every wavelength band from the radio to the gamma-ray.

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Tentacles of the Tarantula Nebula syzygy 9/3/07 3:52 AM

Credit & Copyright: WFI, MPG/ESO 2.2-m Telescope, La Silla, ESO

Explanation: The largest, most violent star forming region known in the whole Local Group of galaxies lies in our neighboring galaxy the Large Magellanic Cloud (LMC). Were the Tarantula Nebula at the distance of the Orion Nebula -- a local star forming region -- it would take up fully half the sky. Also called 30 Doradus, the red and pink gas indicates a massive emission nebula, although supernova remnants and dark nebula also exist there. The bright knot of stars left of center is called R136 and contains many of the most massive, hottest, and brightest stars known. The above image taken with the European Southern Observatory's (ESO's) Wide Field Imager is one of the most detailed ever of this vast star forming region. ESO has made it possible to fly around and into this detailed image by clicking here.

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NGC 253, Sculptor galaxy (3 overlays) syzygy 9/8/07 4:04 AM
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NGC 253 is a large, almost edge-on spiral galaxy, and is one of the nearest galaxies beyond our local neighborhood of galaxies. This dramatic galaxy shows complex structures such as clumpy gas clouds, darkened dust lanes, and young, luminous central star clusters. These elements are typical of spiral galaxies. Caroline Herschel discovered NGC 253 in 1783 while looking for comets. The galaxy's closeness to Earth makes it an ideal target for amateur astronomers who can see the southern sky and for astronomers interested in learning more about the makeup of these stunning cities of stars. -credit-

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NGC 7331, The twin of our Milky Way syzygy 9/8/07 5:14 AM

NGC 7331 sits about 50 million light-years from Earth and has been billed as a twin of our own Milky Way galaxy because of its similar mass, star count and spiral arm shapes. Skywatchers Paul Mortfield and Dietmar Kupke recorded this view of NGC 7331 on Oct. 4, 2005 during a nightly observing program run by Kitt Peak. This image was featured as space.com's Image of the Day.

source: space.com, best selection
The Orion Belt: Alnitak, Alnilam, Mintaka syzygy 9/9/07 3:37 AM

Credit: Digitized Sky Survey, ESA/ESO/NASA FITS Liberator
Color Composite: Davide De Martin (Skyfactory)

Explanation: Alnitak, Alnilam, and Mintaka, are the bright bluish stars from east to west (left to right) along the diagonal in this gorgeous cosmic vista. Otherwise known as the Belt of Orion, these three blue supergiant stars are hotter and much more massive than the Sun. They lie about 1,500 light-years away, born of Orion's well-studied interstellar clouds. In fact, clouds of gas and dust adrift in this region have intriguing and some surprisingly familiar shapes, including the dark Horsehead Nebula and Flame Nebula near Alnitak at the lower left. The famous Orion Nebula itself lies off the bottom of this star field that covers an impressive 4.4x3.5 degrees on the sky. The color picture was composited from digitized black and white photographic plates recorded through red and blue astronomical filters, with a computer synthesized green channel. The plates were taken using the Samuel Oschin Telescope, a wide-field survey instrument at Palomar Observatory, between 1987 and 1991.

M81, Bode's Galaxy syzygy 9/10/07 7:05 AM
M81 in Ursa Major

Credit & Copyright: Tony Hallas

One of the brightest galaxies in planet Earth's sky and similar in size to the Milky Way, big, beautiful spiral M81 lies 11.8 million light-years away in the northern constellation Ursa Major. This remarkably deep image of the region reveals details in the bright yellow core, but at the same time follows fainter features along the galaxy's gorgeous blue spiral arms and sweeping dust lanes. Above M81 lies a dwarf companion galaxy, Holmberg IX, sporting a large, pinkish star-forming region near the top. While M81 and Holmberg IX are seen through a foreground of stars in our own Milky Way galaxy, they are also seen here through a much fainter complex of dust clouds. The relatively unexplored clouds are likely only some hundreds of light-years distant and lie high above our galaxy's plane. Scattered through the image, especially at the the right, the dust clouds reflect the combined light of the Milky Way's stars and have been dubbed integrated flux nebulae.

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The Lagoon Nebula in Gas, Dust, and Stars syzygy 9/10/07 7:47 AM

Credit & Copyright: Antonio Fernandez

Stars are battling gas and dust in the Lagoon Nebula but the photographers are winning. Also known as M8, this photogenic nebula is visible even without binoculars towards the constellation of Sagittarius. The energetic processes of star formation create not only the colors but the chaos. The red-glowing gas results from high-energy starlight striking interstellar hydrogen gas. The dark dust filaments that lace M8 were created in the atmospheres of cool giant stars and in the debris from supernovae explosions. The light from M8 we see today left about 5,000 years ago. Light takes about 50 years to cross this section of M8.

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NGC 4449: Close-Up of a Small Galaxy syzygy 9/10/07 8:01 AM

Credit: NASA, ESA, A. Aloisi (STScI / ESA), Hubble Heritage (STScI / AURA) - ESA/Hubble Collaboration

Grand spiral galaxies often seem to get all the glory. Their newly formed, bright, blue star clusters along beautiful, symmetric spiral arms are guaranteed to attract attention. But small irregular galaxies form stars too, like NGC 4449, located about 12 million light-years away. In fact, this sharp Hubble Space Telescope close-up of the well-studied galaxy clearly demonstrates that reddish star forming regions and young blue star clusters are widespread. Less than 20,000 light-years across, the small island universe is similar in size, and often compared to our Milky Way's satellite galaxy, the Large Magellanic Cloud. NGC 4449 is a member of a group of galaxies found in the constellation Canes Venatici.

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Dust Sculptures in the Rosette Nebula syzygy 9/10/07 8:32 AM

Credit & Copyright: Ignacio de la Cueva Torregrosa

What creates the cosmic dust sculptures in the Rosette Nebula? Noted for the common beauty of its overall shape, parts of the Rosette Nebula, also known as NGC 2244, show beauty even when viewed up close. Visible above are globules of dark dust and gas that are slowly being eroded away by the energetic light and winds by nearby massive stars. Left alone long enough, the molecular-cloud globules would likely form stars and planets. The above image was taken in very specific colors of Sulfur (shaded red), Hydrogen (green), and Oxygen (blue). The Rosette Nebula spans about 50 light-years across, lies about 4,500 light-years away, and can be seen with a small telescope towards the constellation of the Unicorn (Monoceros).

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Barred Spiral Galaxy NGC 1672 syzygy 9/10/07 8:52 AM

Credit: NASA, ESA, Hubble Heritage Team (STScI / AURA) Hubble Heritage (STScI/AURA);
Acknowledgment: L. Jenkins (GSFC/U. Leicester)

Many spiral galaxies have bars across their centers. Even our own Milky Way Galaxy is thought to have a modest central bar. Prominently barred spiral galaxy NGC 1672, pictured above, was captured in spectacular detail in this recently released image taken by the orbiting Hubble Space Telescope. Visible are dark filamentary dust lanes, young clusters of bright blue stars, red emission nebulas of glowing hydrogen gas, a long bright bar of stars across the center, and a bright active nucleus that likely houses a supermassive black hole. Light takes about 60 million years to reach us from NGC 1672, which spans about 75,000 light years across. NGC 1672, which appears toward the constellation of the Swordfish (Dorado), is being studied to find out how a spiral bar contributes to star formation in a galaxy's central regions.

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Re: APOOD - astronomy picture-overlay of the day Frank4 9/10/07 6:37 PM
Good idea! I think APOOD should actually do this themselves - add KML files with each picture of the day.
Frank Taylor - Author of Google Earth Blog
All about Google Earth news, features, tips, technologies, and applications. Also read: http://TahinaExpedition.com
(If you have story ideas, please send me a private message.)
Re: APOOD - astronomy picture-overlay of the day syzygy 9/11/07 2:09 AM
hi Frank!

Good idea! I think APOOD should actually do this themselves - add KML files with each picture of the day.

thanks for feedback! few thoughts about that...
firstly, you must have meant APOD as APOOD was firsty mentioned by me in this topic.
the other thing, there is no chance to meke overlays for every APOD as sometimes those are planets or their features
and sometimes wide-sky photographs ( as today ) when the fiting is impossible. (at least for me)
those NASA guys have some arrears behind me anyway.
the idea is mine and also have started the row so i think now i just have to wait for the mail offering me the job...
i agree with you: it is a very good idea!
Flame Nebula Close-Up syzygy 9/11/07 2:45 AM

Credit & Copyright: Robert Gendler, Jan-Erik Ovaldsen

Of course, the Flame Nebula is not on fire. Also known as NGC 2024, the nebula's suggestive reddish color is due to the glow of hydrogen atoms at the edge of the giant Orion molecular cloud complex some 1,500 light-years away. The hydrogen atoms have been ionized, or stripped of their electrons, and glow as the atoms and electrons recombine. But what ionizes the hydrogen atoms? In this close-up view, a dark lane of absorbing interstellar dust stands out in silhouette against the hydrogen glow and actually hides the true source of the Flame Nebula's energy from optical telescopes. Behind the dark lane lies a cluster of hot, young stars, seen at infrared wavelengths through the obscuring dust. A young, massive star in that cluster is the likely source of energetic ultraviolet radiation that ionizes the hydrogen gas in the Flame Nebula.

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NGC 602 and Beyond syzygy 9/11/07 2:56 AM

Credit: NASA, ESA, and the Hubble Heritage Team (STScI / AURA) - ESA/Hubble Collaboration

Near the outskirts of the Small Magellanic Cloud, a satellite galaxy some 200 thousand light-years distant, lies 5 million year young star cluster NGC 602. Surrounded by natal gas and dust, NGC 602 is featured in this stunning Hubble image of the region. Fantastic ridges and swept back shapes strongly suggest that energetic radiation and shock waves from NGC 602's massive young stars have eroded the dusty material and triggered a progression of star formation moving away from the cluster's center. At the estimated distance of the Small Magellanic Cloud, the picture spans about 200 light-years, but a tantalizing assortment of background galaxies are also visible in the sharp Hubble view. The background galaxies are hundreds of millions of light-years or more beyond NGC 602.

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NGC 6960: The Witch's Broom Nebula syzygy 9/11/07 3:08 AM

Credit & Copyright: T. A. Rector (U. Alaska), WIYN, NOAO, AURA, NSF

Ten thousand years ago, before the dawn of recorded human history, a new light must suddenly have appeared in the night sky and faded after a few weeks. Today we know this light was an exploding star and record the colorful expanding cloud as the Veil Nebula. Pictured above is the west end of the Veil Nebula known technically as NGC 6960 but less formally as the Witch's Broom Nebula. The rampaging gas gains its colors by impacting and exciting existing nearby gas. The supernova remnant lies about 1400 light-years away towards the constellation of Cygnus. This Witch's Broom actually spans over three times the angular size of the full Moon. The bright star 52 Cygnus is visible with the unaided eye from a dark location but unrelated to the ancient supernova.

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Massive Stars in Open Cluster Pismis 24 syzygy 9/12/07 2:47 AM
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Credit: NASA, ESA and J. M. Apellániz (IAA, Spain)

How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, making it a record holder. This star is the brightest object located just to the right of the gas front in the above image. Close inspection of images taken recently with the Hubble Space Telescope, however, have shown that Pismis 24-1 derives its brilliant luminosity not from a single star but from three at least. Component stars would still remain near 100 solar masses, making them among the more massive stars currently on record. Toward the image left, stars are still forming in the associated emission nebula NGC 6357, including several that appear to be breaking out and illuminating a spectacular cocoon.

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IC 2118: The Witch Head Nebula syzygy 9/13/07 12:30 AM
one for Noisette!

IC 2118: The Witch Head Nebula
NGC 2174: Emission Nebula in Orion syzygy 9/13/07 12:44 AM

Credit & Copyright: Dan Kowall (Photonhunter.com)

A lesser known sight in the nebula-rich constellation Orion, NGC 2174 can be found with binoculars near the head of the celestial hunter. About 6,400 light-years distant, the glowing cosmic cloud surrounds loose clusters of young stars. Covering an area larger than the full Moon on the sky, this stunning narrow band image adopts a typical color mapping of the atomic emission from NGC 2174. The false-color mapping shows otherwise red hydrogen emission in green hues and emphasizes sulfur emission in red and oxygen in blue. Placing your cursor on the image will reveal an alternative image of the nebula made through broad band filters. The broad band image combines filters in a closer analogy to human vision, dominated by the red glow of hydrogen.

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NGC 7129 and NGC 7142 syzygy 9/13/07 1:01 AM

Credit & Copyright: Tony Hallas

This alluring telescopic image looks toward the constellation Cepheus and an intriguing visual pairing of dusty reflection nebula NGC 7129 (left) and open star cluster NGC 7142. The two appear separated by only half a degree on the sky, but they actually lie at quite different distances. In the foreground, dusty nebula NGC 7129 is about 3,000 light-years distant, while open cluster NGC 7142 is likely over 6,000 light-years away. In fact, the pervasive and clumpy foreground dust clouds in this region redden the light from NGC 7142, complicating astronomical studies of the cluster. Still, NGC 7142 is thought to be an older open star cluster, while the bright stars embedded in NGC 7129 are perhaps a million years young. The telltale reddish crescent shapes around NGC 7129 are associated with energetic jets streaming away from newborn stars. Surprisingly, despite the dust, far off background galaxies can be seen in the colorful cosmic vista.

P.S.: wide image. sorry i could not fit better!

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IC 5070: A Pelican in the Swan syzygy 9/13/07 1:27 AM

Image Data: Digitized Sky Survey, Color Composite: Charles Shahar

The Pelican Nebula lies about 2,000 light-years away in the high flying constellation Cygnus, the Swan. Also known as IC 5070, this cosmic pelican is appropriately found just off the "east coast" of the North America Nebula (NGC 7000), another surprisingly familiar looking emission nebula in Cygnus. The Pelican and North America nebulae are part of the same large and complex star forming region, almost as nearby as the better-known Orion Nebula. From our vantage point, dark dust clouds (upper left) help define the Pelican's eye and long bill, while a bright front of ionized gas suggests the curved shape of the head and neck. Based on digitized black and white images from the Samuel Oschin Telescope at Palomar Observatory, this striking synthesized color view includes two bright foreground stars and spans about 30 light-years at the estimated distance of the Pelican Nebula.

P.S.: not far from pole, sorry could not fit better!

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Messier 76, "Little Dumbbell Nebula" syzygy 9/13/07 1:41 AM

Credit & Copyright: Stefan Seip

"Nebula at the right foot of Andromeda ... " begins the description for the 76th object in Charles Messier's 18th century Catalog of Nebulae and Star Clusters. In fact, M76 is one of the fainter objects on the Messier list and is also known by the popular name of the "Little Dumbbell Nebula". Like its brighter namesake M27 (the Dumbbell Nebula), M76 is recognized as a planetary nebula - a gaseous shroud cast off by a dying sunlike star. The nebula itself is thought to be shaped more like a donut, while its box-like appearance is due to our nearly edge-on view. Gas expanding more rapidly away from the donut hole produces the faint loops of far flung material. The nebula's dying star can be picked out in this sharp color image as the bottom, blue-tinted member of the double star near the center of the box-like shape. Distance estimates place M76 about 3 to 5 thousand light-years away, making the nebula over a light-year in diameter.

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IC 4628: The Prawn Nebula syzygy 9/13/07 4:28 AM

Credit & Copyright: Martin Pugh

South of Antares, in the tail of the nebula-rich constellation Scorpius, lies emission nebula IC 4628. Nearby hot, massive stars, millions of years young, radiate the nebula with invisible ultraviolet light, stripping electrons from atoms. The electrons eventually recombine with the atoms to produce the visible nebular glow. This narrow band image adopts a typical false-color mapping of the atomic emission, showing hydrogen emission in green hues, sulfur as red and oxygen as blue. At an estimated distance of 6,000 light-years, the region shown is about 250 light-years across. The nebula is also cataloged as Gum 56 for Australian astronomer Colin Stanley Gum, but seafood-loving astronomers might know this cosmic cloud as The Prawn Nebula.

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Reflection Nebulas in Orion syzygy 9/13/07 6:10 AM

Credit & Copyright: T. Rector (U. Alaska Anchorage), H. Schweiker, NOAO, AURA, NSF

In the vast Orion Molecular Cloud complex, several bright blue nebulas are particularly apparent. Pictured above are two of the most prominent reflection nebulas - dust clouds lit by the reflecting light of bright embedded stars. The more famous nebula is M78, near the image center, cataloged over 200 years ago. On the upper left is the lesser known NGC 2071. The image was taken with the Mayall 4-meter telescope on Kitt Peak, Arizona, USA. Astronomers continue to study these reflection nebulas to better understand how interior stars form. The Orion complex lies about 1500 light-years distant, contains the Orion and Horsehead nebulas, and covers much of the constellation of Orion.

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Hidden Galaxy IC 342 syzygy 9/13/07 6:26 AM

Credit & Copyright: Robert Gendler

Similar in size to other large, bright spiral galaxies IC 342 is a mere 7 million light-years distant in the long-necked, northern constellation Camelopardalis. A sprawling island universe, IC 342 would otherwise be a prominent galaxy in our night sky, but it is almost hidden from view behind the veil of stars, gas and dust clouds in the plane of our Milky Way galaxy. Even though IC 342's light is dimmed by intervening cosmic clouds, this remarkably sharp telescopic image traces the galaxy's own obscuring dust, blue star clusters, and glowing pink star forming regions along spiral arms that wind far from the galaxy's core. IC 342 may have undergone a recent burst of star formation activity and is close enough to have gravitationally influenced the evolution of the local group of galaxies and the Milky Way.

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Light from the Heart Nebula syzygy 9/13/07 6:45 AM

Credit & Copyright: Matt Russell

What powers the Heart Nebula? The large emission nebula dubbed IC 1805 looks, in whole, like a human heart. The nebula glows brightly in red light emitted by its most prominent element: hydrogen. The red glow and the larger shape are all created by a small group of stars near the nebula's center. A close up spanning about 30 light years contains many of these stars is shown above . This open cluster of stars contains a few bright stars nearly 50 times the mass of our Sun, many dim stars only a fraction of the mass of our Sun, and an absent microquasar that was expelled millions of years ago. The Heart Nebula is located about 7,500 light years away toward the constellation of Cassiopeia.

P.S.: large picture near the pole. sorry i could not fit better overlay!

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Blue Lagoon syzygy 9/14/07 4:20 AM

Credit & Copyright: Russell Croman

Stars come and go as you slide your cursor over this engaging image of M8, aka the Lagoon Nebula. Of course, the nebula is itself a star-forming region, but the stars that appear and disappear here include background and foreground stars that by chance lie along the same line of sight. In this "for fun" comparison of two nearly identical digital images, the stellar point sources were removed from one image by computer processing to leave only the diffuse emission from the glowing gas clouds. In both pictures, red emission (H-alpha emission) from atomic hydrogen dominates the cosmic lagoon's visible light, but narrow band filters were used to record the image data and map the hydrogen emission to green hues, with emission from sulfur atoms in red and oxygen in blue. The lovely Lagoon Nebula spans about 30 light-years at an estimated distance of 5,000 light-years toward the constellation Sagittarius.
Horse Head Shaped Reflection Nebula IC 4592 syzygy 9/14/07 4:35 AM

Credit & Copyright: Jim Misti and Steve Mazlin, (acquisition), Robert Gendler (processing)

Do you see the horse's head? What you are seeing is not the famous Horsehead nebula toward Orion but rather a fainter nebula that only takes on a familiar form with deeper imaging. The main part of the above imaged molecular cloud complex is a reflection nebula cataloged as IC 4592. Reflection nebulas are actually made up of very fine dust that normally appears dark but can look quite blue when reflecting the light of energetic nearby stars. In this case, the source of much of the reflected light is a star at the eye of the horse. That star is part of Nu Scorpii, one of the brighter star systems toward the constellation of Scorpius. A second reflection nebula dubbed IC 4601 is visible surrounding two stars on the far right.
Bright Galaxy M81 syzygy 9/14/07 4:50 AM

Credit & Copyright: Giovanni Benintende

Big and beautiful spiral galaxy M81 lies in the northern constellation Ursa Major. One of the brightest galaxies in planet Earth's sky, M81 is also home to the second brightest supernova seen in modern times. This superbly detailed view reveals M81's bright yellow nucleus, blue spiral arms, and sweeping cosmic dust lanes with a scale comparable to the Milky Way. Hinting at a disorderly past, a remarkable dust lane actually runs straight through the disk, below and right of the galactic center, contrary to M81's other prominent spiral features. The errant dust lane may be the lingering result of a close encounter between M81 and its smaller companion galaxy, M82. Scrutiny of variable stars in M81 (aka NGC 3031) has yielded one of the best determined distances for an external galaxy -- 11.8 million light-years.
NGC 6888 cosmic bubble and outskirts (2overlays) syzygy 9/14/07 5:52 AM
let's try to operate with two images again:

NGC 6888, also known as the Crescent Nebula, is a cosmic bubble about 25 light-years across, blown by winds from its central, bright, massive star. Near the center of this intriguing widefield view of interstellar gas clouds and rich star fields of the constellation Cygnus, NGC 6888 is about 5,000 light-years away. The three color composite image was created by stacking exposures through narrow band filters that transmit the light from atoms in the clouds. Hydrogen is shown as green, sulfur as red, and oxygen as blue. NGC 6888's central star is classified as a Wolf-Rayet star (WR 136) and is shedding its outer envelope in a strong stellar wind, ejecting the equivalent of our Sun's mass every 10,000 years. Burning fuel at a prodigious rate and near the end of its stellar life, this star should ultimately go out with a bang in a spectacular supernova explosion.

P.S.: first image is a bit large. sorry i cannot fit better!

credits and more: NASA-APOD, NOAO
Spiral Galaxy NGC 2403 from Subaru syzygy 9/14/07 6:11 AM

Credit & Copyright: Suprime-Cam, Subaru Telescope, NAOJ

Sprawling spiral arms dotted with bright red emission nebulas highlight this new and detailed image of nearby spiral galaxy NGC 2403. Also visible in the photogenic spiral galaxy are blue open clusters, dark dust lanes, and a bright but relatively small central nucleus. NGC 2403 is located just beyond the Local Group of Galaxies, at a relatively close 10 million light years away toward the constellation of the Giraffe (Camelopardalis). NGC 2403 has a designated Hubble type of Sc. In 2004, NGC 2403 was home to one of the brightest supernovas of modern times. The above image, the highest resolution complete image of NGC 2403 ever completed, was taken by the Japan's 8.3-meter Subaru telescope located on Mauna Kea, Hawaii, USA.

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The Antennae syzygy 9/14/07 6:34 AM

Credit & Copyright: Daniel Verschatse (Antilhue Observatory)

Some 60 million light-years away in the southerly constellation Corvus, two large galaxies have collided. But stars in the two galaxies - NGC 4038 and NGC 4039 - don't collide in the course of the ponderous, billion year or so long event. Instead, their large clouds of molecular gas and dust do, triggering furious episodes of star formation. Spanning about 500 thousand light-years, this stunning view reveals new star clusters and matter flung far from the scene of the accident by gravitational tidal forces. Of course, the visual appearance of the far-flung arcing structures gives the galaxy pair its popular name - The Antennae. Recorded in this deep image of the region at the tip of the upper arc is a tidal dwarf galaxy NGC 4038S, formed in the cosmic debris.
NGC 6164: A Bipolar Emission Nebula syzygy 9/14/07 7:31 AM

Credit & Copyright: Gemini Obs., AURA, NSF

How did a star form this beautiful nebula? In the middle of emission nebula NGC 6164-5 is an unusually massive star nearing the end of its life. The star, visible in the center of the above image and catalogued as HD 148937, is so hot that the ultraviolet light it emits heats up gas that surrounds it. That gas was likely thrown off from the star, possibly by its fast rotation, like a rotating lawn sprinkler. Expelled material might have been further channeled by the magnetic field of the star, creating the symmetric shape of the bipolar nebula. Several cometary knots of gas are also visible on the lower left. NGC 6164-5 spans about four light years and is located about 4,000 light years away toward the southern constellation Norma.
NGC 5315 Planetary nebula syzygy 10/2/07 10:20 AM
(overlay not available at the moment)

Credit: NASA/ESA/STScI/AURA/The Hubble Heritage Team

You Might Be Surprised at What You Find Out When Ya Go!

Hubble Space Telescope shows an optical image of NGC 5315, a planetary nebula located about 7,000 light years from Earth in the constellation of Circinus.

Planetary nebulas are gaseous clouds created in the last stages of the lifetime of a star like the sun. (Though the term "planetary nebula" is applied to this class of objects, it is a misnomer, like "English horn," as these objects have nothing to do with planets. But the objects looked like planets when viewed through early small optical telescopes.)

NGC 5315 became an X-ray source when powerful winds from a particularly young star at the center collided with the ejected material. This action rendered it visible to the Chandra X-ray telescope, which does not always see planetary nebulas in X-ray light.

Interestingly, astronomers discovered NGC 5315 inadvertently, while searching for the object Hen 2-99 in the same region of space. Although Hen 2-99 was too faint to be detected, the researchers noticed planetary nebula NGC 5315 a large distance away from the aimpoint of the Chandra telescope, where the image is not as sharp.

more: space.com

image from hubblesite
Under the Milky Way syzygy 10/4/07 9:52 AM
This image from NASA's Hubble Space Telescope shows nebula NGC 3603, a young star cluster surrounded by a vast region of dust and gas. Thousands of dazzling young stars nestle within one of the most massive young star clusters in the Milky Way Galaxy.

Credit: NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration
Acknowledgment: J. Maiz Apellaniz (Inst. Astrofisica Andalucia) et al., & Davide de Martin (skyfactory.org)

This prominent star-forming region lies in the Carina spiral arm of the Milky Way, about 20,000 light-years away.

Ultraviolet radiation and winds from the bluest and hottest stars have pushed nebular gas away. Pillars of dense gas, embedded in the walls of the nebula, stretch a few light-years in height, and might incubate new stars.

At the top right lies a relatively small cluster of dark clouds called "Bok globules." These clouds are composed of dense dust and gas, and are about 10 to 50 times more massive than the Sun. A Bok globule may be undergoing a gravitational collapse on its way to forming new stars.

Sir John Herschel first discovered the nebula in 1834. This image spans roughly 17 light-years.

space.com IotD

A mere 20,000 light-years from the Sun lies NGC 3603, a resident of the nearby Carina spiral arm of our Milky Way Galaxy. NGC 3603 is well known to astronomers as one of the Milky Way's largest star-forming regions. The central open star cluster contains thousands of stars more massive than our Sun, stars that likely formed only one or two million years ago in a single burst of star formation. In fact, nearby NGC 3603 is thought to contain a convenient example of the massive star clusters that populate much more distant starburst galaxies. Surrounding the cluster are natal clouds of glowing interstellar gas and obscuring dust, sculpted by energetic stellar radiation and winds. Recorded by the Hubble's Advanced Camera for Surveys, the image spans about 17 light-years.
Acknowledgment: J. Maiz Apellaniz (Inst. Astrofisica Andalucia) et al., & Davide de Martin (skyfactory.org)

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Galaxy NGC 474: Cosmic Blender syzygy 10/8/07 10:04 AM

Credit & Copyright: Mischa Schirmer

What's happening to galaxy NGC 474? The multiple layers of emission appear strangely complex and unexpected given the relatively featureless appearance of the elliptical galaxy in less deep images. The cause of the shells is currently unknown, but possibly tidal tails related to debris left over from absorbing numerous small galaxies in the past billion years. Alternatively the shells may be like ripples in a pond, where the ongoing collision with the spiral galaxy to the right of NGC 474 is causing density waves to ripple though the galactic giant. Regardless of the actual cause, the above image dramatically highlights the increasing consensus that the outer halos of most large galaxies are not really smooth but have complexities induced by frequent interactions with -- and accretions of -- smaller nearby galaxies. The halo of our own Milky Way Galaxy is one example of such unexpected complexity. NGC 474 spans about 250,000 light years and lies about 100 million light years distant toward the constellation of the Fish Pisces.
The Elephant's Trunk in IC 1396 syzygy 10/18/07 10:21 AM

Credit & Copyright: Brian Lula

Like an illustration in a galactic Just So Story, the Elephant's Trunk Nebula winds through the emission nebula and young star cluster complex IC 1396, in the high and far off constellation of Cepheus. Of course, this cosmic elephant's trunk is over 20 light-years long. The false-color view was recorded through narrow band filters that transmit the light from hydrogen (in green), sulfur (in red), and oxygen (in blue) atoms in the region. The resulting composite highlights the bright swept-back ridges that outline pockets of cool interstellar dust and gas. Such embedded, dark, tendril-shaped clouds contain the raw material for star formation and hide protostars within the obscuring cosmic dust. Nearly 3,000 light-years distant, the relatively faint IC 1396 complex covers a large region on the sky, spanning about 5 degrees. This dramatic close-up covers a 1/2 degree wide field, about the size of the Full Moon.

Re: NGC 6888 cosmic bubble and outskirts (2overlays) Philip_Pugh 10/19/07 12:08 AM
Hi Syzygy,

I'm making arrangements to visit a customer in Budapest next month. Are you anywhere near there?

My e-mails are:


Its best to use both.

All the best,

Re: NGC 6888 cosmic bubble and outskirts (2overlays) syzygy 10/19/07 6:28 AM
hi phil!
pretty cool off topic question! ...
well, i am not from Budapest, i am from Hódmezövásárhely, cca. 180 kms far from the capital.
please tell me (next time in PrivateMessage!) if i can help you anyhow!
IC 5067 close up syzygy 10/19/07 6:34 AM

Credit & Copyright: Russell Croman

This amazing skyscape lies along a bright ridge of emission in IC 5067, also known as The Pelican Nebula. Appropriately, the Pelican Nebula itself is part of a much larger, complex star-forming region about 2,000 light-years away in the high flying constellation Cygnus, the Swan. Cosmic dust clouds that span light-years seem to rise like mountains in the mist in this natural color view, recorded through broadband filters to produce an analogy to human color vision. The fantastic shapes are sculpted by winds and radiation from a hot, massive stars and the dominant red emission is due to atomic hydrogen gas. Placing your cursor on the image will bring up a false color image of the nebula made through narrowband filters that also map specific emission from sulfur and oxygen atoms. The mapped color image reveals even more details of the cosmic clouds and their composition.

more from NASA-APOD page
IC 5067 in the Pelican Nebula syzygy 10/19/07 6:36 AM

Credit & Copyright: Antonio Fernandez

The prominent ridge of emission featured in this dramatic skyscape is cataloged as IC 5067. Part of a larger emission nebula with a distinctive shape, popularly called The Pelican Nebula, the ridge spans about 10 light-years following the curve of the cosmic pelican's head and neck. This false color view also translates the pervasive glow of narrow emission lines from atoms in the nebula to a color palate made popular in Hubble Space Telescope images of star forming regions. Fantastic, dark shapes inhabiting the 1/2 degree wide field are clouds of cool gas and dust sculpted by the winds and radiation from hot, massive stars. Close-ups of some of the sculpted clouds show clear signs of newly forming stars. The Pelican Nebula, itself cataloged as IC 5070, is about 2,000 light-years away. To find it, look northeast of bright star Deneb in the high flying constellation Cygnus.

Bend it Like... NGC 134 syzygy 11/15/07 9:18 AM
(overlay not available at the moment)

The image of this spiral galaxy - 60 million light-years away but similar to our Milky Way galaxy - was taken by Janez Potocnik, European Commissioner for Science and Research, during his official visit to the Very Large Telescope (VLT) on Paranal Mountain in Chile. While many galaxies appear as a flat disc, NGC 134 is a warped disc that resembles a bent vinyl record album left out too long in the sun.

Credit: ESO

More than half of spiral galaxies have some type of warping, including the Milky Way and its own small warp. Astronomers still have not cracked the mystery behind the warping effect, but suspect that it might result from interactions or collisions between galaxies. Such galactic encounters can also produce streams of material being pulled out from the galaxy, and this image shows NGC 134 appears to have gas bleeding from the top edge of the disc.

The red features decorating NGC 134's spiral arms represent glowing clouds of hot, gaseous star nurseries known as HII regions. The galaxy also has dark lanes of dust across its disc, which partially obscures its starlight.

more: SPACE.com IoD

image source: ESO
Galaxies in Pegasus syzygy 11/24/07 3:45 AM

Credit & Copyright: Dietmar Hager

This wide, sharp telescopic view reveals galaxies scattered beyond the stars near the northern boundary of the high-flying constellation Pegasus. Prominent at the upper right is NGC 7331. A mere 50 million light-years away, the large spiral is one of the brighter galaxies not included in Charles Messier's famous 18th century catalog. The disturbed looking group of galaxies at the lower left is well-known as Stephan's Quintet. About 300 million light-years distant, the quintet dramatically illustrates a multiple galaxy collision, its powerful, ongoing interactions posed for a brief cosmic snapshot. On the sky, the quintet and NGC 7331 are separated by about half a degree.

more from NASA-APOD
The Race is On, NGC 488 syzygy 12/14/07 8:59 AM
(overlay not available at the moment)

image source: noao

A near-perfect spiral galaxy lies 90 million light years away, its bluish arms containing rings of star formation.

Stars within NGC 488 complete circular orbits at a speed of 205 miles per second (330 km/s), edging out the stars traveling at 137 miles per second (220 km/s) within our own Milky Way. Despite the high speeds, the concentric rings of star formation remain stable � not unlike a pack of racecars maintaining relative position as they round a bend on a galactic racetrack.

The bluish arms are formed by waves of star formation � similar to a stadium crowd doing the "wave" � rather than the motion of the stars.

space.com IoD
NGC 1531/2: Interacting Galaxies syzygy 12/26/07 6:26 AM

Credit & Copyright: T. Rector (U. Alaska Anchorage), Gemini Obs., AURA, NSF

This dramatic image of an interacting pair of galaxies was made using 8-meter Gemini South telescope at Cerro Pachon, Chile. NGC 1531 is the background galaxy with a bright core just above center and NGC 1532 is the foreground spiral galaxy laced with dust lanes. The pair is about 55 million light-years away in the southern constellation Eridanus. These galaxies lie close enough together so that each feels the influence of the other's gravity. The gravitational tug-of-war has triggered star formation in the foreground spiral as evidenced by the young, bright blue star clusters along the upper edge of the front spiral arm. Though the spiral galaxy in this pair is viewed nearly edge-on, astronomers believe the system is similar to the face-on spiral and companion known as M51, the Whirlpool Galaxy.

I'll Have a Blue (Snowball) Christmas with NGC 766 syzygy 12/30/07 3:33 AM
sorry a bit late...
(and so sorry, overlay not available at the moment!)

image source: panther-observatory

Just in time for Christmas, this image of NGC 7662, known as the "Blue Snowball," arrives.

NGC 7662 is a planetary nebula in the constellation of Andromeda. (The term "planetary nebula" is misleading. These objects were originally named such as the result of their resemblance to planets such as Uranus, but they have nothing to do with planets.) These nebulae represent the final stage of a smaller star's life, at which time the core of the star contracts and rises in temperature. The outer layers of the star are ultimately blown outward into a gigantic cloud and ionized, producing the characteristic glow of a planetary nebula.

more at space.com
A galaxy and a comet AlbertoConti 1/2/08 2:14 PM
Astronomy Picture of the Day: Jan 02, 2008

Explanation: This gorgeous galaxy and comet portrait was recorded on December 30th, in the skies over Hoogeveen, The Netherlands. The combined series of 60 x 60 second exposures finds the lovely green coma of Comet 8P/Tuttle near its predicted conjunction with the Triangulum Galaxy. Aligning each exposure with the stars shows the comet as a streak, slowly moving against the background stars and galaxy. An alternative composition with exposures centered on the comet, shows the background stars and galaxy as streaks. The alluring celestial scene would also have been a rewarding one for the influential 18th century comet hunter Charles Messier. While Messier scanned French skies for comets, he carefully cataloged positions of things which were fuzzy and comet-like in appearance but did not move against the background stars and so were definitely not comets. The Triangulum Galaxy, also known as M33, is the 33rd object in his famous not-a-comet catalog. The modern understanding holds that the Triangulum Galaxy is a large spiral galaxy some 3 million light-years distant. Comet 8P/Tuttle, just bright enough to be visible to the unaided eye in dark, northern skies, is about 40 million kilometers (2 light-minutes) away.

Solved using Astrometry.net
Dr. Alberto Conti Space Telescope Science Institute
Double Supernova Remnants DEM L316 syzygy 1/15/08 9:58 AM
thank you Alberto for great overlay! welcome to work!

Credit & Copyright: Gemini Observatory, GMOS-South, NSF

Are these two supernova shells related? To help find out, the 8-meter Gemini Telescope located high atop a mountain in Chile was pointed at the unusual, huge, double-lobed cloud dubbed DEM L316. The resulting image, shown above, yields tremendous detail. Inspection of the image as well as data taken by the orbiting Chandra X-Ray Observatory indicate how different the two supernova remnants are. In particular, the smaller shell appears to be the result of Type Ia supernova where a white dwarf exploded, while the larger shell appears to be the result of a Type II supernova where a massive normal star exploded. Since those two stellar types evolve on such different time scales, they likely did not form together and so are likely not physically associated. Considering also that no evidence exists that the shells are colliding, the two shells are now hypothesized to be superposed by chance. DEM L316 lies about 160,000 light years away in the neighboring Large Magellanic Cloud (LMC) galaxy, spans about 140 light-years across, and appears toward the southern constellation of the Swordfish (Dorado). NASA-APOD

more details on Gemini page
Different Fur syzygy 2/1/08 9:01 AM

Credit: Canada-France-Hawaii Telescope/Coelum

This vibrant image depicts a turbulent area of outer space which, to some, evokes a fox, hence the name Fox Fur Nebula. It lies in the constellation Monoceros, the Unicorn, near the left arm of Orion, just below the large, bright star S Mon (not visible in this image).

The enigmatically textured shapes comprise dust and gas, whipped into peculiar shapes by powerful stellar winds. Blue-colored areas are formed of dust reflecting starlight. Red areas are glowing from emission caused by the ionization of hydrogen gas by starlight.

The Fox Fur Nebula is part of a much larger complex known as The Christmas Tree Cluster.

space.com - IoD
Spiral Galaxy NGC 2841 syzygy 3/31/08 1:21 AM

Credit & Copyright: Johannes Schedler (Panther Observatory)

Some 50 million light-years distant, spiral galaxy NGC 2841 can be found in the northern constellation of Ursa Major. This sharp view of the gorgeous island universe shows off a striking yellow nucleus and galactic disk with tightly wound spiral arms. NGC 2841 has a diameter of over 150,000 light-years, even larger than our own Milky Way Galaxy. The galaxy's dust lanes and turbulent star-forming regions are found along the spiral arms, but X-ray images suggest that resulting winds and stellar explosions create plumes of hot gas extending into a halo around NGC 2841. Of course, the prominent stars with a spiky appearance in the picture are close foreground objects within the Milky Way and not associated with NGC 2841.

Star Forming Region NGC 3582 syzygy 4/27/08 11:40 PM

Credit & Copyright: T. A. Rector (U. Alaska), T. Abbott, NOAO, AURA, NSF

What's happening in the NGC 3582 nebula? Bright stars and interesting molecules are forming. The complex nebula resides in the star forming region called RCW 57. Visible in this image are dense knots of dark interstellar dust, bright stars that have formed in the past few million years, fields of glowing hydrogen gas ionized by these stars, and great loops of gas expelled by dying stars. A recent detailed study of NGC 3582 uncovered at least 33 massive stars in the end stages of formation, and the clear presence of the complex carbon molecules known as polycyclic aromatic hydrocarbons (PAHs). PAHs are thought to be created in the cooling gas of star forming regions, and their development in the Sun's formation nebula five billion years ago may have been an important step in the development of life on Earth. This picture was taken last year with the Blanco 4-meter telescope at the Cerro Tololo Inter-American Observatory (CTIO), in Chile.

more: NASA - APOD
Exploring the Ring - Ring Nebula (M57) syzygy 9/18/08 4:30 AM

Credit & Copyright: Astro-Cooperation - Stefan Heutz/Wolfgang Ries

A familiar sight for northern hemisphere astronomers, the Ring Nebula (M57) is some 2,000 light-years away in the musical constellation Lyra. The central ring is about one light-year across, but this remarkably deep exposure - a collaborative effort combining data from two different telescopes - explores the looping filaments of glowing gas extending much farther from the nebula's central star. Of course, in this well-studied example of a planetary nebula, the glowing material does not come from planets. Instead, the gaseous shroud represents outer layers expelled from a dying, sun-like star. This composite image includes over 16 hours of narrow-band data intended to recorded the red emission from hydrogen atoms, but the pronounced blue/green color is due to emission from oxygen atoms at higher temperatures within the ring. The much more distant spiral galaxy IC 1296 is also visible at the upper right.

more from: NASA-APOD
Re: APOOD - astronomy picture-overlay of the day ChrisHeinz 9/18/08 5:03 PM
Welcome back!
Re: APOOD - astronomy picture-overlay of the day syzygy 9/20/08 3:40 AM
hi Chris!
glad to hear from you!
always be sure i am on guard! so do as been a scout as a child... (hungarian scout greeting: Be on guard!)
i keep watcing my source pages and put up one as find one worths to.
(sorry, still cannot understand those "superoverlay" things. i fit the images manual all cases. hope these are not so bad, and still represent some additional value on GE.)
In the Heart of the Tarantula Nebula syzygy 4/14/09 1:32 AM

Credit: ESA, NASA, ESO, & Danny LaCrue

In the heart of monstrous Tarantula Nebula lies huge bubbles of energetic gas, long filaments of dark dust, and unusually massive stars. In the center of this heart, is a knot of stars so dense that it was once thought to be a single star. This star cluster, labeled as R136 or NGC 2070, is visible just above the center of the above image and home to a great number of hot young stars. The energetic light from these stars continually ionizes nebula gas, while their energetic particle wind blows bubbles and defines intricate filaments. The above representative-color picture of this great LMC nebula details its tumultuous center. The Tarantula Nebula, also known as the 30 Doradus nebula, is one of the largest star-formation regions known, and has been creating unusually strong episodes of star formation every few million years.

more: nasa-apod
Hidden Treasures of M78 syzygy 1/28/11 3:19 AM

Credit: ESO / Igor Chekalin

M78 isn't really hiding in planet Earth's night sky. About 1,600 light-years away and nestled in the nebula rich constellation Orion, the large, bright, reflection nebula is well-known to telescopic skygazers. But this gorgeous image of M78 was selected as the winner of the Hidden Treasures 2010 astrophotography competition. Held by the European Southern Observatory (ESO), the competition challenged amateur astronomers to process data from ESO's astronomical archive in search of cosmic gems. The winning entry shows off amazing details within bluish M78 (center) embraced in dark, dusty clouds, along with a smaller reflection nebula in the region, NGC 2071 (top). Yellowish and even more compact, the recently discovered, variable McNeil's Nebula is prominent in the scene below and right of center. Based on data from ESO's WFI camera and 2.2 meter telescope at La Silla, Chile, this image spans just over 0.5 degrees on the sky. That corresponds to 15 light-years at the estimated distance of M78.

more credits: nasa-apod
Re: Hidden Treasures of M78 spacecowboy2006 1/28/11 9:31 AM
You must have moved your image for it is now an X. I wanted to see how good of an overlay you did, I wsnt even going to attempt it myself, lol. Perhaps you will re-do it.
Pic is Mount Diablo, California; it is also the point setting for my snapshot default, because it is one of the most meaningful geographic places in the world.______ http://www.mtdiablocam.com/
___ If you open this link scroll down to where it has Geography.
Re: Hidden Treasures of M78 syzygy 1/28/11 1:42 PM
sorry friend, i do not know what could be the problem by you...
it works by me.

p.s.: still might be not the best fitting anyway...(:
Re: Hidden Treasures of M78 Markopolo 1/29/11 8:59 PM
It loaded up just fine for me, syzgy. And the alignment is just fine, the background stars move only very slightly when you "blink" the overlay off and on, which is my way of checking alignment. Good job, and thanks!
Wherever you go, there you are.

Google Sky Blank Spot Explained
Hanny's Voorwerp syzygy 2/11/11 8:31 AM

Credit: NASA, ESA, W. Keel (Univ. Alabama), et al., Galaxy Zoo Team

Hanny's Voorwerp, Dutch for "Hanny's Object", is enormous, about the size of our own Milky Way Galaxy. Glowing strongly in the greenish light produced by ionized oxygen atoms, the mysterious voorwerp is below spiral galaxy IC 2497 in this view from the Hubble Space Telescope. Both lie at a distance of some 650 million light-years in the faint constellation Leo Minor. In fact, the enormous green cloud is now suspected to be part of a tidal tail of material illuminated by a quasar inhabiting the center of IC 2497. Powered by a massive black hole, the quasar suddenly turned off, leaving only galaxy and glowing voorwerp visible in telescopes at optical wavelengths. The sharp Hubble image also resolves a star forming region in the voorwerp, seen in yellow on the side near IC 2497. That region was likely compressed by an outflow of gas driven from the galaxy's core. The remarkable mystery object was discovered by Dutch schoolteacher Hanny van Arkel in 2007 while participating online in the Galaxy Zoo project. Galaxy Zoo enlists the public to help classify galaxies found in the Sloan Digital Sky Survey, and more recently in deep Hubble imagery.

further credits and more from nasa-apod
Re: The Lagoon Nebula in Gas, Dust, and Stars ET_Explorer_2012 5/5/11 8:46 PM
Stunning, Colorful New Look at the Lagoon Nebula

by Nancy Atkinson on May 5, 2011

A portion of the Lagoon nebula imaged by the Gemini South telescope with the Gemini Multi-Object Spectrograph. Credit: Julia I. Arias and Rodolfo H. Barbá Departamento de Física, Universidad de La Serena (Chile), and ICATE-CONICET (Argentina).

Wow, is this gorgeous or what?! Argentinean astronomers Julia Arias and Rodolfo Barbá used the Gemini South telescope in Chile to obtain this stunning new image, allowing us to dive right into part of the Lagoon Nebula (M8). This region of the Lagoon is sometimes called the “Southern Cliff” because it resembles a sharp drop-off. Beyond the cliff, light from a spattering of young background stars in the upper left of the image shines through the cloudscape.

The Lagoon nebula is located in the towards the constellation Sagittarius in the southern Milky Way. Viewed through large amateur telescopes, it appears as a pale ghostly glow with a touch of pink. In this image, the astronomers used special filters to reveal characteristics of the gas clouds. The reds, blues and greens represent each of three data sets results in a very strong color differentiation. And so, this isn’t what the Lagoon Nebula would actually look like were we to travel there and take a look with our own eyes. Two narrow-band optical filters sensitive to hydrogen (red) and ionized sulfur (green) emission, and another that transmits far red light (blue). And so, for example, light from the far-red end of the spectrum, beyond what the eye can see, appears blue in this image.

Arias and Barbá obtained the imaging data to explore the evolutionary relationship between the newborn stars and what are known as Herbig-Haro (HH) objects. HH objects form when young stars eject large amounts of fast-moving gas as they grow. This gas plows into the surrounding nebula, producing bright shock fronts that glow as the gas is heated by friction and surrounding gas is excited by the high-energy radiation of nearby hot stars. The researchers found a dozen of these HH objects in the image, spanning sizes that range from a few thousand astronomical units (about a trillion kilometers) to 1.4 parsecs (4.6 light-years), i.e. a little greater than the distance from the Sun to its nearest neighbor Proxima Centauri.

Source: http://www.universetoday.com/85439/stunning-colorful-new-look-at-the-lagoon-nebula/

I'm concentrating on staying healthy,
having peace, being happy,
remembering what is important,
taking in nature and animals,
spending time reading, trying to
understand the universe, where
science and the spiritual meet.
Joan Jett


NGC 7293: The Helix Nebula syzygy 1/15/14 5:22 AM
two overlays of this beautiful object:
one from the NASA-APOD article as usual and another from a linked page in it.

p.s.: (hotlinked image sources in KMZ file. one day might be broken)

syzygy 1/15/14 5:24 AM <This message has been deleted.>
Massive Nearby Spiral Galaxy NGC 2841 syzygy 4/21/14 11:54 PM

Image Credit: HubbleSubaruComposition & Copyright: Robert Gendler

Explanation: It is one of the more massive galaxies known. A mere 46 million light-years distant, spiral galaxy NGC 2841 can be found in the northern constellation of Ursa Major. This sharp view of the gorgeous island universe shows off a striking yellow nucleus and galactic disk. Dust lanes, small, pink star-forming regions, and young blue star clusters are embedded in the patchy, tightly wound spiral arms. In contrast, many other spirals exhibit grand, sweeping arms with large star-forming regions. NGC 2841 has a diameter of over 150,000 light-years, even larger than our own Milky Way and captured by this composite image merging exposures from the orbiting 2.4-meter Hubble Space Telescope and the ground-based 8.2-meter Subaru TelescopeX-ray images suggest that resulting winds and stellar explosions create plumes of hot gas extending into a halo around NGC 2841.

all copied from:

p.s.: (hotlinked image source in KMZ file. one day might be broken)
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