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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #721  
Παλιά 19-11-08, 07:40
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Τελευταία φορά Online: 12-11-16 10:12
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Unusual Auroras Over Saturn's North Pole
Credit: Cassini VIMS Team, JPL, ESA, NASA

Explanation: What's causing this unusual aurora over Saturn? No one is sure. Infrared images by the robotic Cassini spacecraft of the north pole of Saturn have uncovered aurora unlike any other seen previously in our Solar System. The strange aurora are shown in blue in the above image, while the underlying clouds are shown in red. The previously recorded, also-strange hexagon cloud patterns are visible in red below the aurora. These Saturnian aurora can cover the entire pole, while auroras around Earth and Jupiter are typically confined by magnetic fields to rings surrounding the magnetic poles. More normal auroral rings had been previously imaged around Saturn. The recently imaged strange auroras above Saturn's north pole can change their global patterns significantly in only a few minutes. The large and variable nature of these auroras indicate that charged particles streaming in from the Sun are experiencing some type of magnetism above Saturn that was previously unexpected.

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  #722  
Παλιά 20-11-08, 07:45
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Endeavour in the Moon
Credit & Copyright: Marek Kozubal, Clay Center Observatory at Dexter and Southfield Schools

Explanation: Glaring near the top of the frame, the shuttle orbiter Endeavour rockets into the night on the STS-126 mission. Endeavour left planet Earth on November 14 from Launch Pad 39A at NASA's Kennedy Space Center, making the 27th flight to the International Space Station. To record the dramatic view, the camera was placed so the shuttle's flight path tracked across the Moon, from a vantage point in Indian River City, Florida. Near picture center the almost full, perigee Moon shining through thin clouds silhouettes the shuttle's dense exhaust trail. On board the space station, the crew and the STS-126 astronauts can celebrate the orbital outpost's 10th anniversary today. Construction of the International Space Station officially began with the November 20, 1998 Russian launch of the station's first element, the bus-sized Zarya module.

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  #723  
Παλιά 21-11-08, 07:35
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M76 Above and Below
Credit & Copyright: Don Goldman

Explanation: Also known by the popular name the "Little Dumbbell Nebula", M76 is one of the fainter objects listed in Charles Messier's 18th century Catalog of Nebulae and Star Clusters. Like its better-known 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, its central box-like appearance due to our nearly edge-on view. Gas expanding more rapidly away from the donut hole produces the more extensive, far flung material in this remarkable image that uses narrow-band filters to highlight the emission from hydrogen (in red) and oxygen atoms (in greenish blue). In particular, complex oxygen emission features are seen above and below the main nebula to a degree not detected in most images of M76. Distance estimates place M76 about 3 to 5 thousand light-years away toward the heroic constellation Perseus, making the nebula over a light-year in diameter.

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  #724  
Παλιά 22-11-08, 07:24
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From Moonrise to Sunset
Credit & Copyright: Miguel Claro

Explanation: In this panorama of Earth and sky recorded on Thursday, November 13, the Full Moon rises along the eastern horizon at the far left. Of course, the Full Moon rises at sunset and that Thursday's setting Sun was also captured at the far right. In between, 17 digital images are stitched together to follow the horizon to the south in a lovely twilight portrait of the city of Lisbon, Portugal. The serene view takes in part of the longest bridge in Europe, the Vasco da Gama bridge, beneath the rising Moon and ends at the mouth of the Tagus River looking west toward the sunset and the Atlantic Ocean. The photographer's vantage point was Lisbon's 100 foot high Cristo Rei monument on the south bank of the Tagus, at the foot of the port city's other famous bridge, the Ponte 25 de Abril.

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Mε τα βελάκια θαυμάστε αυτή την πανοραμική εκπληκτική εικόνα της Λισαβώνας. Μιγκέλ σε ζηλεύω.

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Τελευταία επεξεργασία από το χρήστη Xenios : 22-11-08 στις 07:26
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  #725  
Παλιά 22-11-08, 09:38
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Administratore Symphoroso (Ιταλιστι)
 

Τελευταία φορά Online: 17-10-14 00:05
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Η διαθεσή μου τώρα:
τα βελακια δεν δουλευουν...
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  #726  
Παλιά 23-11-08, 07:06
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In the Vicinity of the Cone Nebula
Credit & Copyright: T. A. Rector (NRAO), NOAO, AURA, NSF Credit:

Explanation: Strange shapes and textures can be found in neighborhood of the Cone Nebula. The unusual shapes originate from fine interstellar dust reacting in complex ways with the energetic light and hot gas being expelled by the young stars. The brightest star on the right of the above picture is S Mon, while the region just above it has been nicknamed the Fox Fur Nebula for its color and structure. The blue glow directly surrounding S Mon results from reflection, where neighboring dust reflects light from the bright star. The orange glow that encompasses the whole region results not only from dust reflection but also emission from hydrogen gas ionized by starlight. S Mon is part of a young open cluster of stars named NGC 2264, located about 2500 light years away toward the constellation of Monoceros. The origin of the mysterious geometric Cone Nebula, visible on the far left, remains a mystery.

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  #727  
Παλιά 24-11-08, 07:54
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Radar Indicates Buried Glaciers on Mars
Data Reconstruction Credit : NASA/JPL-Caltech/UTA/UA/MSSS/ESA/DLR/JPL Solar System Visualization Project

Explanation: What created this unusual terrain on Mars? The floors of several mid-latitude craters in Hellas Basin on Mars appear unusually grooved, flat, and shallow. New radar images from the Mars Reconnaissance Orbiter bolster an exciting hypothesis: huge glaciers of buried ice. Evidence indicates that such glaciers cover an area larger than a city and extend as much as a kilometer deep. The ice would have been kept from evaporating into the thin Martian air by a covering of dirt. If true, this would indicate the largest volume of water ice outside of the Martian poles, much larger than the frozen puddles recently discovered by the Phoenix lander. Such lake-sized ice blocks located so close to the Martian equator might make a good drinking reservoir for future astronauts exploring Mars. How the glaciers originally formed remains a mystery. In the meantime, before packing up to explore Mars, please take a moment to suggest a name for NASA's next Martian rover.

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  #728  
Παλιά 25-11-08, 07:33
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Fireball Over Edmonton
Credit & Copyright Global Television Edmonton, YouTube

Explanation: What if you're driving down the street and an object from space shoots across the sky right in front of you? Such was the case last week for many people in south central Canada. Specifically, an extremely bright fireball, presumably a desk-sized meteor from deep space, flashed across the sky just after sunset on 2008 November 20. The bright fireball was recorded on many images and movies, including the spectacular video shown above that was captured by a dashboard camera of a police cruiser in Edmonton, Alberta, Canada. Because at least two streaks appear to be visible, the falling object likely broke up into pieces as it fell deep into Earth's atmosphere. By triangulating fireball images from several simultaneously recorded sources, astronomers hope to find an approximate orbit from whence the object came, as well as the likely place(s) on Earth where large pieces would have impacted, were they to have survived reentry. In the best case scenario, pieces would be recovered from a known deep space comet or asteroid, giving humanity an unprecedented look at an ancient object that likely holds clues to the early years of our Earth and the Solar System.

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  #729  
Παλιά 26-11-08, 07:21
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The Horsehead Nebula in Orion
Credit & Copyright: Adam Block (Caelum Observatory) Mt. Lemmon SkyCenter, U. Arizona

Explanation: One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion, is part of a large, dark, molecular cloud. Also known as Barnard 33, the unusual shape was first discovered on a photographic plate in the late 1800s. The red glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. A blue reflection nebula dubbed NGC 2023 surrounds the bright star at the lower left. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left. Streams of gas leaving the nebula are funneled by a strong magnetic field. Bright spots in the Horsehead Nebula's base are young stars just in the process of forming. Light takes about 1500 years to reach us from the Horsehead Nebula. The above image was taken earlier this month with a 0.6-meter telescope at the Mt. Lemmon SkyCenter in Arizona, USA.

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  #730  
Παλιά 26-11-08, 07:46
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High Elf
 

Τελευταία φορά Online: 08-05-17 14:17
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Η διαθεσή μου τώρα:
Ααααα το αλογοκεφαλο νεφελωμα.... απο τα πιο γνωστα... εχω καμια δεκαρια απιστευτες εναλλακτικες φωτογραφιες του σε διαφορετικες αναλυσεις και αποχρωσεις... γκουγκλαρετε horsehead nebula και θαυμαστε!
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  #731  
Παλιά 27-11-08, 07:52
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Galaxies in the River
Credit & Copyright: Robert Gendler, Jan-Erik Ovaldsen, Allan Hornstrup, IDA
Image data: ESO/Danish 1.5m telescope at La Silla, Chile - 2008

Explanation: Large galaxies grow by eating small ones. Even our own galaxy practices galactic cannibalism, absorbing small galaxies that get too close and are captured by the Milky Way's gravity. In fact, the practice is common in the universe and well illustrated by this striking pair of interacting galaxies from the banks of the southern constellation Eridanus (The River). Located over 50 million light years away, the large, distorted spiral NGC 1532 is seen locked in a gravitational struggle with dwarf galaxy NGC 1531, a struggle the smaller galaxy will eventually lose. Seen edge-on, spiral NGC 1532 spans about 100,000 light-years. The NGC 1532/1531 pair is thought to be similar to the system of face-on spiral and small companion known as M51, the Whirlpool Galaxy.

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  #732  
Παλιά 28-11-08, 08:28
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Τελευταία φορά Online: Σήμερα 11:44
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Probably a Planet for Beta Pic
Credit: ESO, A.-M. Lagrange (LAOG), et al.

Explanation: A mere 50 light-years away, young star Beta Pictoris became one of the most important stars in the sky in the early 1980s. Satellite and ground-based telescopic observations revealed the presence of a surrounding outer, dusty, debris disk and an inner clear zone about the size of our solar system -- strong evidence for the formation of planets. Now, infrared observations from European Southern Observatory telescopes incorporated in this composite offer a detection of a source in the clear zone that is most likely a giant planet orbiting Beta Pic. Designated Beta Pictoris b, the new source is more than 1,000 times fainter than the direct starlight that has been carefully subtracted from the image data. It is aligned with the disk at a projected distance that would place it near the orbit of Saturn if found in our solar system. Confirmation that the new source is a planet will come if future observations can demonstrate that the source moves in an orbit around the star. When confirmed, it will be the closest planet to its parent star directly imaged ... so far.

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  #733  
Παλιά 29-11-08, 08:52
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Chilean Skyscape
Credit & Copyright: Yuri Beletsky (ESO)

Explanation: Night skies over Chilean mountain top observatories can be dark and clear, with glorious cosmic vistas. In this recent example, the plane of our Milky Way galaxy stretches parallel to the horizon, the galactic center's star clusters, dark dust clouds, and glowing nebulae hovering in the west. Recorded after sunset, the wedge of light extending upward through the scene is Zodiacal light, sunlight scattered by dust along the solar system's ecliptic plane. A faint meteor was also caught in the view, but approaching a conjunction, brilliant Venus and bright Jupiter dominate the skyscape. A close pairing through this weekend, by Monday, December 1, they will be joined by the young crescent Moon. Look west after sunset and the tight celestial triangle formed by Moon, Venus, and Jupiter, the three brightest beacons in the night, will be a spectacular sight, even from bright-sky urban locations all over the world.

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  #734  
Παλιά 30-11-08, 11:27
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Τελευταία φορά Online: 12-11-16 10:12
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An Apollo 15 Panorama: Astronaut Exploring
Credit: Apollo 15 Crew, USGS, NASA

Explanation: What would it be like to explore the Moon? NASA's Apollo missions gave humans just this chance in the late 1960s and early 1970s. In particular, the Apollo 15 mission was dedicated to better understanding the surface of the Moon by exploring mountains, valleys, maria, and highlands. Astronauts David Scott and James Irwin spent nearly three days on the Moon while Alfred Worden orbited above in the Command Module. The mission, which blasted off from Earth on 1971 July 26, was the first to deploy a Lunar Roving Vehicle. Pictured above in this digitally stitched mosaic panorama, David Scott examines a boulder in front of the summit of Mt. Hadley Delta. The shadow of James Irwin is visible to the right, while scrolling to the right will reveal a well-lit and diverse lunar terrain. The Apollo 15 mission returned about 76 kilograms of moon rocks for detailed study. In the future, NASA and other space agencies plan to continue to lead humanity's exploration of the Moon, Mars, and beyond.


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  #735  
Παλιά 01-12-08, 08:43
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Massive Stars Resolved in the Carina Nebula
Credit: NASA, ESA, and J. Maíz Apellániz (Instituto de Astrofísica de Andalucía, Spain)

Explanation: How massive can stars be? Big, hefty stars live short violent lives that can profoundly affect their environments. Isolating a massive star can be problematic, however, since what seems to be a single bright star might actually turn out to be several stars close together. Such was the case for two of the brightest objects visible in the open star cluster Trumpler 16, located in the southern Carina Nebula. Upon close inspection by the Hubble Space Telescope, WR 25, the brightest object in the above image, was confirmed to consist of at least two separate stars. Additionally, Tr16 -244, just to the upper right of WR 25, was resolved for the first time to be at least three individual stars. Even so, the brightest star in WR 25 appears to be about 50 times the mass of our Sun, making it one of the more massive stars known. Winds from these stars are likely significant contributers to the large bubble that the star cluster sits in. The Carina Nebula, home to unusually shaped dust clouds and the famous variable star Eta Carina, lies about 7,500 light years away toward the constellation of Ship's Keel (Carina).

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