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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #346  
Παλιά 13-12-07, 09:10
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Τελευταία φορά Online: 12-11-16 11:12
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T Tauri and Hind's Variable Nebula
Credit & Copyright: Don Goldman

Explanation: The orange star centered in this remarkable telescopic skyview is T Tauri, protoytpe of the class of T Tauri variable stars. Nearby it is a dusty yellow cosmic cloud historically known as Hind's Variable Nebula (NGC 1555/1554). Over 400 light-years away, at the edge of a molecular cloud, both star and nebula are seen to vary significantly in brightness but not necessarily at the same time, adding to the mystery of the intriguing region. T Tauri stars are now generally recognized as young (less than a few million years old), sun-like stars still in the early stages of formation. To further complicate the picture, infrared observations indicate that T Tauri itself is part of a multiple system and suggest that the associated Hind's Nebula may also contain a very young stellar object. The dramatic color image spans about 4 light-years at the estimated distance of T Tauri.

Tomorrow's picture: moonscape
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  #347  
Παλιά 14-12-07, 09:30
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Τελευταία φορά Online: 12-11-16 11:12
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Για να δείτε την σημερινή φωτογραφία, λόγω μεγάλου μεγέθους θα πατήστε αυτό το link.

Apollo 17: Shorty Crater Panorama
Credit: Apollo 17 Crew, NASA; Panorama Assembly: Mike Constantine

Explanation: In December of 1972, Apollo 17 astronauts Eugene Cernan and Harrison Schmitt spent about 75 hours on the Moon in the Taurus-Littrow valley, while colleague Ronald Evans orbited overhead. This sharp panorama is digitally stitched together from pictures taken by Cernan as he and Schmitt roamed the valley floor. Starting with a view of the imposing South Massif, scrolling the panorama to the right will reveal Schmitt and the lunar rover at the edge of Shorty Crater, near the spot where geologist Schmitt discovered orange lunar soil. The Apollo 17 crew returned with 110 kilograms of rock and soil samples, more than was returned from any of the other lunar landing sites. Now thirty five years later, Cernan and Schmitt are still the last to walk on the Moon.

Tomorrow's picture: skyscape
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  #348  
Παλιά 15-12-07, 09:38
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Τελευταία φορά Online: 12-11-16 11:12
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Mountains of Creation
Credit: Lori Allen (Harvard-Smithsonian CfA) et al., JPL-Caltech, NASA

Explanation: (xxxedit and linkxxx) This fantastic skyscape lies at the eastern edge of giant stellar nursery W5, about 7,000 light-years away in the constellation Cassiopeia. An infrared view from the Spitzer Space Telescope, it features interstellar clouds of cold gas and dust sculpted by winds and radiation from a hot, massive star outside the picture (just above and to the right). Still swaddled within the cosmic clouds, newborn stars are revealed by Spitzer's penetrating gaze, their formation also triggered by the massive star. Fittingly dubbed "Mountains of Creation", these interstellar clouds are about 10 times the size of the analogous Pillars of Creation in M16, made famous in a 1995 Hubble Space Telescope view. W5 is also known as IC 1848 and together with IC 1805 it is part of a complex region popularly dubbed the Heart and Soul Nebulae. The Spitzer image spans about 70 light-years at the distance of W5.

Tomorrow's picture: double space

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  #349  
Παλιά 16-12-07, 10:46
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2007 December 16

The Holographic Principle
Image Credit & Copyright: E. Winfree, K. Fleischer, A. Barr et al. (Caltech)

Explanation: Is this picture worth a thousand words? According to the Holographic Principle, the most information you can get from this image is about 3 x 1065 bits for a normal sized computer monitor. The Holographic Principle, yet unproven, states that there is a maximum amount of information content held by regions adjacent to any surface. Therefore, counter-intuitively, the information content inside a room depends not on the volume of the room but on the area of the bounding walls. The principle derives from the idea that the Planck length, the length scale where quantum mechanics begins to dominate classical gravity, is one side of an area that can hold only about one bit of information. The limit was first postulated by physicist Gerard 't Hooft in 1993. It can arise from generalizations from seemingly distant speculation that the information held by a black hole is determined not by its enclosed volume but by the surface area of its event horizon. The term "holographic" arises from a hologram analogy where three-dimension images are created by projecting light though a flat screen. Beware, other people looking at the above image may not claim to see 3 x 1065 bits -- they might claim to see a teapot.

Tomorrow's picture: moon rings

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  #350  
Παλιά 17-12-07, 09:21
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2007 December 17

Saturn's Ancient Rings
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: How old are Saturn's rings? No one is quite sure. One possibility is that the rings formed relatively recently in our Solar System's history, perhaps only about 100 million years ago when a moon-sized object broke up near Saturn. Evidence for a young ring age includes a basic stability analysis for rings, and the fact that the rings are so bright and relatively unaffected by numerous small dark meteor impacts. New evidence, however, raises the possibility that some of Saturn's rings may be billions of years old and so almost as old as Saturn itself. Inspection of images by the Saturn-orbiting Cassini spacecraft indicates that some of Saturn's ring particles temporarily bunch and collide, effectively recycling ring particles by bringing fresh bright ices to the surface. Seen here, Saturn's rings were imaged in their true colors by the robotic Cassini in late October. Icy bright Tethys, a moon of Saturn likely brightened by a sandblasting rain of ice from sister moon Enceladus, is visible in front of the darker rings.

APOD presents: Astronomy Pictures of the Year for 2007
Tomorrow's picture: unusual martian soil

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  #351  
Παλιά 18-12-07, 09:08
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Τελευταία φορά Online: 12-11-16 11:12
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Unusual Silica Rich Soil Discovered on Mars
Credit: Mars Exploration Rover Mission, Cornell, JPL, NASA

Explanation: You're rolling across Mars when you unexpectedly uncover some unusually light soil. You stop. You turn. You return to inspect the soil and find out it is almost purely silica -- the main ingredient in quartz and glass. Such soil has never been found on Mars before. What created this soil? Since you are the robotic rover Spirit currently rolling across Mars, you send the images and data back to Earth for analysis. Your scientist friends from the blue water planet say that such soil on Earth is usually created by either volcanic steam or a hot spring. The second hypothesis in particular indicates, once again, a wet past for part of Mars, as possibly hot water saturated with silica deposited the white soil. Intriguingly, on Earth, living microbes typically flourish under either condition. Pictured above, the uncovered light soil is visible on the right.

APOD presents: Astronomy Pictures of the Year for 2007
Tomorrow's picture: window in the sky

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  #352  
Παλιά 18-12-07, 12:52
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  #353  
Παλιά 19-12-07, 09:35
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Τελευταία φορά Online: 12-11-16 11:12
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Stars and Dust through Baade's Window
Credit & Copyright: Stephane Guisard

Explanation: Billions of stars light up the direction toward the center of our Galaxy. The vast majority of these stars are themselves billions of years old, rivaling their home Milky Way Galaxy in age. Together with interstellar dust, these old stars combine to create this yellowish starscape. Although the opaque dust obscures the true Galactic center in visible light, there is a low density hole in the dust on the right of the image. The region, named Baade's Window for the German astronomer who studied it, is used to inspect distant stars and to determine the internal geometry of the Milky Way. Baade's Window lies toward the constellation of the Archer (Sagittarius).

APOD presents: Astronomy Pictures of the Year for 2007
Tomorrow's picture: the 1970s

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  #354  
Παλιά 20-12-07, 09:48
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Reflections on the 1970s
Credit & Copyright: Martin Pugh

Explanation: The 1970s are sometimes ignored by astronomers. In particular, this beautiful grouping of reflection nebulae in Orion - NGC 1977, NGC 1975, and NGC 1973 - are usually overlooked in favor of the substantial glow from the nearby stellar nursery better known as the Orion Nebula. Found along Orion's sword just north of the bright Orion Nebula complex, these reflection nebulae are also associated with Orion's giant molecular cloud about 1,500 light-years away, but are dominated by the characteristic blue color of interstellar dust reflecting light from hot young stars. North is down in this sharp color telescopic image from New South Wales, Australia, so the more familiar Orion Nebula borders the top of the view. NGC 1977 stretches across the field just above center, separated from NGC 1973 (below left) and NGC 1975 (below right) by darker regions of obscuring dust. Many northern hemisphere observers claim to see the general shape of a running man in the cosmic dust cloud but, of course, they're looking at the view upside down.

APOD presents: Astronomy Pictures of the Year for 2007
Tomorrow's picture: panorama up

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  #355  
Παλιά 21-12-07, 09:42
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Horizon to Horizon
Credit & Copyright: Laurent Laveder (PixHeaven.net)

Explanation: Scroll right and journey from horizon to horizon as your gaze sweeps through the zenith in the night sky over Beg-Meil, France. Recorded on December 13th, the entertaining panorama (image key) covers 210 degrees in 21 separate exposures, beginning on the beach with bright star Sirius rising in the southeast. Look up (pan right) to encounter the nebula rich constellation of Orion and continue on to find the lovely Pleiades star cluster. Farther along, higher in the sky, is the famous Comet Holmes, still gracing the northern hemisphere's night with its remarkable expanding coma. Finally, just before diving into the urban glow from city lights along the northwestern horizon (far right), check out the double star cluster in Perseus and take in the cosmic streak of a bright Geminid Meteor.

APOD presents: Astronomy Pictures of the Year for 2007
Tomorrow's picture: solstice sky

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  #356  
Παλιά 21-12-07, 11:40
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Τελευταία φορά Online: 17-10-14 00:05
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Παλιά 21-12-07, 12:36
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Παλιά 21-12-07, 12:44
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Τελευταία φορά Online: 12-11-16 11:12
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Είναι μια απίστευτη φωτογραφία ...
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  #359  
Παλιά 21-12-07, 13:06
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  #360  
Παλιά 21-12-07, 13:10
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