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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #706  
Παλιά 07-11-08, 09:17
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Τελευταία φορά Online: 12-11-16 11:12
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Cygnus Trio
Credit & Copyright: J-P Metsävainio (Astro Anarchy)

Explanation: In this colorful mosaic, filaments of gas and dust span some 9 degrees across central Cygnus, a nebula rich constellation along the northern Milky Way. A trio of nebulae with popular names highlights the beautiful skyscape - the Butterfly, the Crescent, and the Tulip. At left, the Butterfly Nebula (IC 1318), lies near bright star Gamma Cygni. The Butterfly's expansive, glowing, wing-shaped gas clouds are divided by a dark dust lane. Near center, the Crescent Nebula (NGC 6888) is more compact, a cosmic bubble with a bright edge blown by winds from a massive Wolf-Rayet star. On the right is the Tulip Nebula (Sh2-101), a small emission region shaped like a blossoming flower viewed from the side. All are within a few thousand light-years of the Sun in the Orion spiral arm of our galaxy. The gorgeous mosaic is presented in false color, constructed from image data recorded through narrow band filters. The range of colors was created by a mapping of emission from hydrogen, sulfur and oxygen atoms in the nebula to red, green, and blue hues.

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  #707  
Παλιά 07-11-08, 10:09
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High Elf
 

Τελευταία φορά Online: 08-05-17 14:17
Φύλο: Δεν έχω αποφασίσει ακόμα
Η διαθεσή μου τώρα:
Πολυ ομορφη φωτογραφια για τοσο χαμηλη αναλυση!!! Αν τη βρει κανενας πουθενα σε μεγαλυτερη, ας μας το πει

(ναι, και αυτη που εκανα κλικ στην πηγη, μικρη ειναι)
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  #708  
Παλιά 07-11-08, 10:12
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Τελευταία φορά Online: 12-11-16 11:12
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Αρχική Δημοσίευση από Gildor Εμφάνιση μηνυμάτων
Πολυ ομορφη φωτογραφια για τοσο χαμηλη αναλυση!!! Αν τη βρει κανενας πουθενα σε μεγαλυτερη, ας μας το πει
Δες μια λεπτομέρεια της εδώ.
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  #709  
Παλιά 08-11-08, 09:51
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Τελευταία φορά Online: 12-11-16 11:12
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On the Trail of 2008 TC3
Credit: Mohamed Elhassan Abdelatif Mahir (Noub NGO), Dr. Muawia H. Shaddad (Univ. Khartoum),
Dr. Peter Jenniskens (SETI Institute/NASA Ames)

Explanation: On October 7, the early dawn over northern Sudan revealed this twisted, high altitude trail. Captured in a video frame, the long-lasting persistent train is from the impact of a small asteroid cataloged as 2008 TC3. That event was remarkable because it was the first time an asteroid was detected in space before crashing into planet Earth's atmosphere. In fact, after astronomers discovered 2008 TC3, the time and location of its impact were predicted based on follow-up observations. Later, the impact predictions were confirmed by sensors, including a Meteosat-8 image of a bright flash in the atmosphere. Astronomers are now hoping for more reports of local ground-based observations of what must have been a brilliant meteor streaking through Sudan's night sky. Additional reports could improve the chances of recovering meteorites.

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  #710  
Παλιά 09-11-08, 09:27
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Τελευταία φορά Online: 12-11-16 11:12
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Two Black Holes Dancing in 3C 75
Credit: A. Ginsburg (U. Colorado - Boulder) et al., BGPS Team, GLIMPSE II Team

Explanation: What's happening at the center of active galaxy 3C 75? The two bright sources at the center of this composite x-ray (blue)/ radio (pink) image are co-orbiting supermassive black holes powering the giant radio source 3C 75. Surrounded by multimillion degree x-ray emitting gas, and blasting out jets of relativistic particles the supermassive black holes are separated by 25,000 light-years. At the cores of two merging galaxies in the Abell 400 galaxy cluster they are some 300 million light-years away. Astronomers conclude that these two supermassive black holes are bound together by gravity in a binary system in part because the jets' consistent swept back appearance is most likely due to their common motion as they speed through the hot cluster gas at 1200 kilometers per second. Such spectacular cosmic mergers are thought to be common in crowded galaxy cluster environments in the distant universe. In their final stages the mergers are expected to be intense sources of gravitational waves.

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Σχόλιο : Μαύρη τρύπα που μας έφαγε....
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  #711  
Παλιά 09-11-08, 10:16
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High Elf
 

Τελευταία φορά Online: 08-05-17 14:17
Φύλο: Δεν έχω αποφασίσει ακόμα
Η διαθεσή μου τώρα:
Αφου η υπαρξη τους δεν εχει αποδειχτει
__________________
Υπάρχουν σε όλα δύο απόψεις...
Αυτή που λέω εγώ, και η σωστή!
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  #712  
Παλιά 10-11-08, 08:23
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Τελευταία φορά Online: 12-11-16 11:12
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Our Galaxy's Central Molecular Zone
Credit: A. Ginsburg (U. Colorado - Boulder) et al., BGPS Team, GLIMPSE II Team

Explanation: The central region of our Milky Way Galaxy is a mysterious and complex place. Pictured here in radio and infrared light, the galaxy's central square degree is highlighted in fine detail. The region is known as the Central Molecular Zone. While much of the extended emission is due to dense gas laced with molecules, also seen are emission nebulas lit up by massive young stars, glowing supernova remnants, and the curving Galactic Center Radio Arc in purple. The identity and root cause for many other features remains unknown. Besides a massive black hole named Sgr A*, the Galactic Center houses the galaxy's most active star forming region. This image is not just interesting scientifically. It's esthetic beauty won first prize this year in the AUI/NRAO Image Contest.

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  #713  
Παλιά 11-11-08, 09:59
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Τελευταία φορά Online: Σήμερα 18:46
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The Cosmic Web of the Tarantula Nebula
Credit & Copyright: Joseph Brimacombe

Explanation: First cataloged as a star, 30 Doradus is actually an immense star forming region in nearby galaxy The Large Magellanic Cloud. The region's spidery appearance is responsible for its popular name, the Tarantula nebula, except that this tarantula is about 1,000 light-years across, and 180,000 light-years away in the southern constellation Dorado. If the Tarantula nebula were at the distance of the Orion Nebula (1,500 light-years), the nearest stellar nursery to Earth, it would appear to cover about 30 degrees (60 full moons) on the sky. The spindly arms of the Tarantula nebula surround NGC 2070, a star cluster that contains some of the brightest, most massive stars known. Intriguing details of the nebula are visible in this scientifically-colored image. The cosmic Tarantula also lies near the site of the closest recent supernova.

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An eye for an eye, will make us all blind... Mahatma Ghandi
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  #714  
Παλιά 12-11-08, 09:00
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Phoenix and the Holy Cow
Image Credit: Marco Di Lorenzo, Kenneth Kremer,
Phoenix Mission, NASA, JPL, UA, Max Planck Inst., Spaceflight

Explanation: The northern Martian summer is waning. As predicted, a decline in daylight hours, deteriorating weather, and dust storms are preventing solar arrays on the Phoenix Mars Lander from providing power. Phoenix's last signal was received on November 2, its successful mission ending after more than five months in the arctic region of the Red Planet, a run that exceeded its planned operational lifetime. Attempting to discover if Mars' surface has ever been able to support microbial life, Phoenix performed an extensive analysis of the soil and returned a wealth of image data. Of course, one of the lander's most exciting results was the detection of water-ice near the Martian surface. Recorded in October, this picture from the lander's Robotic Arm Camera shows the region under the Phoenix with flat, exposed icy patches. That area caused researchers to exclaim "Holy Cow!" when it was first imaged a few days after the May 25 touchdown of the Phoenix Mars Lander.

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  #715  
Παλιά 13-11-08, 08:45
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Τελευταία φορά Online: Σήμερα 18:46
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A Bubble in Cygnus
Image Credit & Copyright: Keith Quattrocchi, Mel Helm

Explanation: Adrift in the rich star fields of the constellation Cygnus, this lovely, symmetric bubble nebula was only recently recognized and may not yet appear in astronomical catalogs. In fact, amateur astronomer Dave Jurasevich identified it as a nebula on July 6 in his images of the complex Cygnus region that included the Crescent Nebula (NGC 6888). He subsequently notified the International Astronomical Union. Only eleven days later the same object was independently identified by Mel Helm at Sierra Remote Observatories, imaged by Keith Quattrocchi and Helm, and also submitted to the IAU as a potentially unknown nebula. Their final composite image is seen here, including narrow-band image data that highlights the nebula's delicate outlines. What is the newly recognized bubble nebula? Like the Crescent Nebula itself, this cosmic bubble could be blown by winds from a massive Wolf-Rayet star, or it could be a spherically-shaped planetary nebula, a final phase in the life of a sun-like star.

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  #716  
Παλιά 14-11-08, 08:51
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Τελευταία φορά Online: 12-11-16 11:12
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Fomalhaut b
Credit: NASA, ESA, P. Kalas, J. Graham, E. Chiang, E. Kite (Univ. California, Berkeley),
M. Clampin (NASA/Goddard), M. Fitzgerald (Lawrence Livermore NL),
K. Stapelfeldt, J. Krist (NASA/JPL)

Explanation: Fomalhaut (sounds like "foam-a-lot") is a bright, young, star, a short 25 light-years from planet Earth in the direction of the constellation Piscis Austrinus. In this sharp composite from the Hubble Space Telescope, Fomalhaut's surrounding ring of dusty debris is imaged in detail, with overwhelming glare from the star masked by an occulting disk in the camera's coronagraph. Astronomers now identify, the tiny point of light in the small box at the right as a planet about 3 times the mass of Jupiter orbiting 10.7 billion miles from the star (almost 14 times the Sun-Jupiter distance). Designated Fomalhaut b, the massive planet probably shapes and maintains the ring's relatively sharp inner edge, while the ring itself is likely a larger, younger analog of our own Kuiper Belt - the solar system's outer reservoir of icy bodies. The Hubble data represent the first visible-light image of a planet circling another star.

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  #717  
Παλιά 15-11-08, 09:50
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Τελευταία φορά Online: 12-11-16 11:12
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Arp 273
Credit & Copyright: Adam Block, Mount Lemmon SkyCenter, University of Arizona

Explanation: The two prominent stars in the foreground of this colorful skyscape are well within our own Milky Way Galaxy. Their spiky appearance is due to diffraction in the astronomer's telescope. But the two eye-catching galaxies in view lie far beyond the Milky Way, at a distance of about 200 million light-years. Their distorted appearance is due to gravitational tides as the pair engage in close encounters. From our perspective, the bright cores of the galaxies are separated by about 80,000 light-years. Cataloged as Arp 273 (also as UGC 1810), the galaxies do look peculiar, but interacting galaxies are now understood to be common in the universe. In fact, the nearby large spiral Andromeda Galaxy is known to be some 2 million light-years away and approaching the Milky Way. Arp 273 may offer an analog of their far future encounter. Repeated galaxy encounters on a cosmic timescale can ultimately result in a merger into a single galaxy of stars.

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  #718  
Παλιά 16-11-08, 08:31
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Τελευταία φορά Online: 12-11-16 11:12
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Anticrepuscular Rays Over Colorado
Credit & Copyright: John Britton

Explanation: What's happening over the horizon? Although the scene may appear somehow supernatural, nothing more unusual is occurring than a setting Sun and some well placed clouds. Pictured above are anticrepuscular rays. To understand them, start by picturing common crepuscular rays that are seen any time that sunlight pours though scattered clouds. Now although sunlight indeed travels along straight lines, the projections of these lines onto the spherical sky are great circles. Therefore, the crepuscular rays from a setting (or rising) sun will appear to re-converge on the other side of the sky. At the anti-solar point 180 degrees around from the Sun, they are referred to as anticrepuscular rays. Pictured above is a particularly striking set of anticrepuscular rays photographed in 2001 from a moving car just outside of Boulder, Colorado, USA.

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  #719  
Παλιά 17-11-08, 09:16
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Τελευταία φορά Online: 12-11-16 11:12
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HR 8799: Discovery of a Multi-planet Star System
Credit: C. Marois et al., NRC Canada

Explanation: How common are planetary systems like our own Solar System? In the twelve years previous to 2008, over 300 candidate planetary systems have been found orbiting nearby stars. None, however, were directly imaged, few showed evidence for multiple planets, and many had a Jupiter-sized planet orbiting inside the orbit of Mercury. Last week, however, together with recent images of Fomalhaut b, the above picture was released showing one of first confirmed images of planets orbiting a distant Sun-like star. HR 8799 has a mass about 1.5 times that of our own Sun, and lies about 130 light years from the Sun -- a distance similar to many stars easily visible in the night sky. Pictured above, a 10-meter Keck telescope in Hawaii captured in infrared light three planets orbiting an artificially obscured central star. The 8-meter Gemini North telescope captured a similar image. Each planet likely contains several times the mass of Jupiter, but even the innermost planet, labelled d, orbits out near the orbit of Neptune. Although the HR 8799 planetary system has significant differences with our Solar System, it is a clear demonstration that complex planetary systems exists, systems that could conceivable contain an Earth-like planet.

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  #720  
Παλιά 18-11-08, 08:15
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Restored: First Image of the Earth from the Moon
Credit: NASA/LOIRP

Explanation: Pictured above is the first image ever taken of the Earth from the Moon. The image was taken in 1966 by Lunar Orbiter 1 and heralded by then-journalists as the Image of the Century. It was taken about two years before the Apollo 8 crew snapped its more famous color cousin. Recently, modern technology has allowed the recovery of higher resolution images from old data sources such as Lunar Orbiter tapes than every before. Specifically, the above image recovery was led by Nancy Evans as part of the Lunar Orbiter Image Recovery Project. Images like that above carry more than aesthetic value -- comparison to recent high definition images of the Moon enables investigations into how the Moon has been changing.

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