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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #1576  
Παλιά 16-02-11, 09:11
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Τελευταία φορά Online: 12-11-16 11:12
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Comet Tempel 1 from Stardust-NeXT Spacecraft
Credit: NASA, JPL-Caltech, Cornell

Explanation: No comet has ever been visited twice before. Therefore, the unprecedented pass of the Stardust-NeXT spacecraft near Comet Tempel 1 earlier this week gave humanity a unique opportunity to see how the nucleus of a comet changes over time. Changes in the nucleus of Comet Tempel 1 were of particular interest because the comet was hit with an impactor from the passing Deep Impact spacecraft in 2005. Pictured above is one digitally sharpened image of Comet Tempel 1 near the closest approach of Stardust-NeXT. Visible are many features imaged in 2005, including craters, ridges, and seemingly smoother areas. Few firm conclusions are yet available, but over the next few years astronomers who specialize in comets and the understanding the early Solar System will be pouring over these images looking for new clues as to how Comet Tempel 1 is composed, how the 2005 impact site now appears, and how general features of the comet have evolved.

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Σχόλιο : Η NASA με τις δύο αποστολές της σε κομήτες, μας τους έχει απομυθοποιήσει
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  #1577  
Παλιά 17-02-11, 08:08
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X-Class Flare
Credit: NASA / Goddard / SDO AIA Team

Explanation: On Valentine's Day (ET) the Sun unleased one of its most powerful explosions, an X-class flare. The blast was the largest so far in the new solar cycle. Erupting from active region AR1158 in the Sun's southern hemisphere, the flare is captured here in this extreme ultraviolet image from the Solar Dynamics Observatory (SDO). The intense burst of electromagnetic radiation momentarily overwhelmed pixels in SDO's detectors causing the bright vertical blemish. This X-class flare was also accompanied by a coronal mass ejection (CME), a massive cloud of charged particles traveling outward at nearly 900 kilometers per second. Skywatchers at high latitudes should be alert for aurorae tonight.

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jimil (17-02-11)
  #1578  
Παλιά 18-02-11, 09:46
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Planetary Nebula Project
Credit & Copyright: J-P Metsävainio (Astro Anarchy)

Explanation: Cast off by dying sunlike stars, planetary nebulae are a brief but glorious final phase of stellar evolution. The gaseous shrouds are ionized by an extremely hot central source, the shrinking core of a star running out of fuel for nuclear fusion. Shining in the cosmic night, their simple symmetries are fascinating and have inspired this planetary nebula poster project. In it, nine planetaries are displayed for comparison in a 3x3 grid. Of course, planetary nebula fans should be able to pick out the bright Messier objects M27 - the Dumbbell Nebula, M76 - the Little Dumbbell, and M57 - the Ring Nebula, as well as NGC 6543, aka the Cat's Eye Nebula. Lesser known nebulae include the Medusa and the Bug. All the images were made with detailed narrow band data and are shown at the same angular scale, spanning 20 arc minutes (1/3 degree). At that scale, the grey circle represents the apparent size of the Full Moon. These planetary nebulae hint at the fate of our own Sun as its core runs out of nuclear fuel in another 5 billion years.

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jimil (19-02-11)
  #1579  
Παλιά 19-02-11, 10:29
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Spiral Galaxy NGC 2841 Close Up
Credit: NASA, ESA, and the Hubble Heritage (STScI / AURA) - ESA / Hubble Collaboration

Explanation: 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, but this close-up Hubble image spans about 34,000 light-years along the the galaxy's inner region. X-ray images suggest that resulting winds and stellar explosions create plumes of hot gas extending into a halo around NGC 2841.

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jimil (19-02-11), Naias (20-02-11)
  #1580  
Παλιά 20-02-11, 09:06
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Mammatus Clouds Over Olympic Valley
Credit & License: Matt Saal (Wikipedia)

Explanation: What's happened to these clouds? Normal cloud bottoms are flat because moist warm air that rises and cools will condense into water droplets at a very specific temperature, which usually corresponds to a very specific height. After water droplets form that air becomes an opaque cloud. Under some conditions, however, cloud pockets can develop that contain large droplets of water or ice that fall into clear air as they evaporate. Such pockets may occur in turbulent air near a thunderstorm, being seen near the top of an anvil cloud, for example. Resulting mammatus clouds can appear especially dramatic if sunlit from the side. These mammatus clouds were photographed last August over Olympic Valley, California, USA.

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  #1581  
Παλιά 21-02-11, 09:50
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Milky Way Over Switzerland
Credit: Stephane Vetter (Nuits sacrees)

Explanation: What's visible in the night sky during this time of year? To help illustrate the answer, a beautiful land, cloud, and skyscape was captured earlier this month over Neuchâtel, Switzerland. Visible in the foreground were the snow covered cliffs of the amphitheater shaped Creux du Van, as well as distant trees, and town-lit clouds. Visible in the night sky (at midnight) were galaxies including the long arch of the central band of our Milky Way Galaxy, the Andromeda galaxy (M31), and the Triangulum galaxy (M33. Star clusters visible included NGC 752, M34, M35, M41, the double cluster, and the Beehive (M44). Nebulas visible included the Orion Nebula (M42), NGC 7822, IC 1396, the Rosette Nebula, the Flaming Star Nebula, the California Nebula, the Heart and Soul Nebulas, and the Pacman Nebula. Rolling your cursor over the above image will bring up labels for all of these. But the above wide angle sky image captured even more sky wonders. What other nebulas can you find in the above image?

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jimil (21-02-11)
  #1582  
Παλιά 22-02-11, 08:08
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Star Size Comparisons
Credit & Copyright: morn1415 (YouTube)

Explanation: How big is our Sun compared to other stars? In a dramatic and popular video featured on YouTube, the relative sizes of planets and stars are shown from smallest to largest. The above video starts with Earth's Moon and progresses through increasingly larger planets in our Solar System. Next, the Sun is shown along as compared to many of the brighter stars in our neighborhood of the Milky Way Galaxy. Finally, some of the largest stars known spin into view. Note that the true sizes of most stars outside of the Sun and Betelgeuse are not known by direct observation, but rather inferred by measurements of their perceived brightness, temperature, and distance. Although an inspiring learning tool that is mostly accurate, APOD readers are encouraged to complete the learning experience -- and possibly help make future versions more accurate -- by pointing out slight inaccuracies in the video.

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jimil (23-02-11)
  #1583  
Παλιά 23-02-11, 09:00
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The Solar System from MESSENGER
Credit: NASA/JHU APL/CIW

Explanation: If you looked out from the center of the Solar System, what would you see? Nearly such a view was taken recently from the MESSENGER spacecraft currently orbiting the Sun from the distance of Mercury. The Sun's planets all appear as points of light, with the closest and largest planets appearing the brightest. The planets all appear to orbit in the same direction and are (nearly) confined to the same great circle around the sky -- the ecliptic plane. Mercury, Venus, Earth, Mars, Jupiter, and Saturn are all visible in the above horizontally compressed image, while the positions of Uranus and Neptune are labeled even though they are too faint to make out. Pluto, which has had its planetary status recently called into question, is much too faint to see. Earth's Moon is visible, however, as are the Galilean moons of Jupiter. The above image is the reverse of one taken from the outside of the Solar System in 1990 by Voyager 1. MESSENGER, which has flown by Mercury three times now, is on schedule to enter orbit around the Solar System's innermost planet next month.

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  #1584  
Παλιά 24-02-11, 09:00
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NGC 1999: South of Orion
Image Credit & Copyright: Adam Block, Mt. Lemmon SkyCenter, U. Arizona

Explanation: South of the large star-forming region known as the Orion Nebula, lies bright blue reflection nebula NGC 1999. Also at the edge of the Orion molecular cloud complex some 1,500 light-years distant, NGC 1999's illumination is provided by the embedded variable star V380 Orionis. The nebula is marked with a dark sideways T-shape near center in this broad cosmic vista that spans over 10 light-years. The dark shape was once assumed to be an obscuring dust cloud seen in silhouette against the bright reflection nebula. But recent infrared images indicate the shape is likely a hole blown through the nebula itself by energetic young stars. In fact, this region abounds with energetic young stars producing jets and outflows that create luminous shock waves. Cataloged as Herbig-Haro (HH) objects, named for astronomers George Herbig and Guillermo Haro, the shocks appear bright red in this view that includes HH1 and HH2 just below NGC 1999. The stellar jets and outflows push through the surrounding material at speeds of hundreds of kilometers per second.

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jimil (24-02-11)
  #1585  
Παλιά 25-02-11, 09:02
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NGC 4449: Close-up of a Small Galaxy
Credit: Data - Hubble Legacy Archive, ESA, NASA; Processing - Robert Gendler

Explanation: Grand spiral galaxies often seem to get all the glory. Their young, blue star clusters and pink star forming regions along sweeping spiral arms are guaranteed to attract attention. But small irregular galaxies form stars too, like NGC 4449, about 12 million light-years distant. 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 (LMC). This remarkable Hubble Space Telescope close-up of the well-studied galaxy was reprocessed to highlight the telltale reddish glow of hydrogen gas. The glow traces NGC 4449's widespread star forming regions, some even larger than those in the LMC, with enormous interstellar arcs and bubbles blown by short-lived, massive stars. NGC 4449 is a member of a group of galaxies found in the constellation Canes Venatici. Interactions with the nearby galaxies are thought to have influenced star formation in NGC 4449.

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jimil (25-02-11)
  #1586  
Παλιά 26-02-11, 09:31
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Τελευταία φορά Online: 12-11-16 11:12
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Shell Galaxies in Pisces
Image Credit & Copyright: Stephen Leshin

Explanation: This colorful cosmic skyscape features a peculiar system of galaxies cataloged as Arp 227 some 100 million light-years distant. Swimming within the boundaries of the constellation Pisces, Arp 227 consists of the two galaxies prominent on the left; the curious shell galaxy NGC 474 and its blue, spiral-armed neighbor NGC 470. The faint, wide arcs or shells of NGC 474 could have been formed by a gravitational encounter with neighbor NGC 470. Alternately the shells could be caused by a merger with a smaller galaxy producing an effect analogous to ripples across the surface of a pond. Remarkably, the large galaxy on the right hand side of the deep image, NGC 467, appears to be surrounded by faint shells too, evidence of another interacting galaxy system. Intriguing background galaxies are scattered around the field that also includes spiky foreground stars. Of course, those stars lie well within our own Milky Way Galaxy. The field of view spans 25 arc minutes or about 1/2 degree on the sky.

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jimil (27-02-11)
  #1587  
Παλιά 27-02-11, 09:17
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Saturn's Hyperion: A Moon with Odd Craters
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: What lies at the bottom of Hyperion's strange craters? Nobody's sure. To help find out, the robot Cassini spacecraft now orbiting Saturn swooped past the sponge-textured moon in 2005 and 2010 and took images of unprecedented detail. An image from the 2005 pass, shown above in false color, shows a remarkable world strewn with strange craters and a generally odd surface. The slight differences in color likely show differences in surface composition. At the bottom of most craters lies some type of unknown dark material. Inspection of the image shows bright features indicating that the dark material might be only tens of meters thick in some places. Hyperion is about 250 kilometers across, rotates chaotically, and has a density so low that it might house a vast system of caverns inside.

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Σχόλιο : Σαν παγωμένο σφουγγάρι μοιάζει...
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jimil (27-02-11)
  #1588  
Παλιά 27-02-11, 11:47
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"We are all in the gutter, but some of us are looking at the stars." Oscar Wilde
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  #1589  
Παλιά 28-02-11, 10:13
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Red Snow Moon Over Edmonton
Credit & Copyright: Luca Vanzella

Explanation: What's hovering between those buildings? The Moon. The above image was taken two weeks ago as the full Snow Moon started to rise above Edmonton, Alberta, Canada. The odd coincidence between the angular size of the far distant Moon and the angular width of nearby buildings created a striking juxtaposition. Backing away from the buildings so to reduce their angular size was a key to planning the image. The temperature was so low, -25 C, that plumes of steam rose from neighboring oil refineries. The above image was taken during a momentary break in the plumes. The rising Moon appears red here for the same reason that a setting Sun appears red -- because blue light is preferentially scattered away by intervening air. In this case, the shimmering steam plumes likely also caused the Moon to appear slightly compressed. The next full moon, the full Worm Moon, will occur in mid-March.

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  #1590  
Παλιά 01-03-11, 09:10
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Discovery Visits the Space Station
Credit: Space Shuttle STS-133 Crew, Space Station Expedition 26 Crew, NASA

Explanation: What's happening outside the space station? A space shuttle has docked. Five days ago, the space shuttle Discovery was launched to the International Space Station, carrying six crew members and the large Leonardo Multi Purpose Logistics Module. Three days ago, as pictured above, the docked shuttle was prepared to be unloaded by the space stations Dextre robot and Canadarm2. The above expansive photo captures much more, however, including Japan's Kibo Experiment Module on the lower right, Earth across the top of the frame, and a seemingly starless backdrop of space in the distance. During the next week, the shuttle and ISS crews are scheduled to permanently attach Leonardo as well as fix and upgrade parts of the ISS. After 38 previous voyages, this is expected to be the last space mission for the Space Shuttle Discovery.

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