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Εργαλεία Θεμάτων Αξιολόγηση: Αξιολόγηση θέματος: 91 Ψήφοι, 4,95 κατά μέσο όρο. Τρόποι εμφάνισης
  #46  
Παλιά 25-02-07, 10:10
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Τελευταία φορά Online: 12-11-16 10:12
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The Far Side of the Moon
Credit: Apollo 16 Crew, NASA

Explanation: Does this moon look familiar? Possibly not, even though it is Earth's Moon. Locked in synchronous rotation, the Moon always presents its well-known near side to Earth. But from lunar orbit, Apollo astronauts also grew to know the Moon's far side. This sharp picture from Apollo 16's mapping camera shows the eastern edge of the familiar near side (top) and the strange and heavily cratered far side of the Moon. Surprisingly, the rough and battered surface of the far side looks very different from the near side which is covered with smooth dark lunar maria. The likely explanation is that the far side crust is thicker, making it harder for molten material from the interior to flow to the surface and form the smooth maria.

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  #47  
Παλιά 26-02-07, 15:16
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A Rocket Debris Cloud Drifts
Credit & Copyright: Robert H. McNaught

Explanation: What's that cloud drifting in space? It's not an astronomical nebula -- those appear to stay put. Atmospheric clouds don't look like this. The answer to last week's sky mystery turned out to be orbiting and expanding debris from the upper stage of a failed Russian rocket that exploded unexpectedly. The cloud became visible to unaided southern hemisphere observers, and its cause was initially unknown. The above time lapse movie shows the cloud drifting as seen from Australia. Streaks in and near the cloud are likely large pieces of debris. The debris cloud is more than an astronomical curiosity -- particles from this cloud and others could become projectiles damaging existing satellites. As the cloud disperses, many particles will fall to Earth, but many more may help make low Earth orbit an increasingly hostile environment.

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  #48  
Παλιά 27-02-07, 08:06
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Atmospheres Detected for Two Extrasolar Planets
Credit: NASA/JPL-Caltech/T. Pyle (SSC)

Explanation: Do extrasolar planets have water? In an attempt to find out, the orbiting Spitzer Space Telescope made detailed observations of the atmospheres of two planets that orbit stars other than our Sun. Unfortunately, water vapor was not detected in either exoplanet. Spitzer watched star systems HD 209458b and HD 189733b closely in infrared light both before and after the parent stars eclipsed their known planets. By comparing eclipsed and uneclipsed spectra very closely, astronomers could deduce bright light-emitting atmospheric gasses that were being blocked during eclipse. Were water vapor one of these atmospheric gases, a new indication that life might exist outside of our Solar System would have been found. The planets being analyzed are known as hot Jupiters -- they have sizes close to Jupiter but orbits closer to the distance of Mercury. The above illustration shows an artist's depiction of one of these dry worlds. Although no water vapor was detected this time, the techniques of measuring exoplanet atmospheres are quite promising, and the search for distant water and other biomakers is just beginning.

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  #49  
Παλιά 28-02-07, 09:21
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Stars, Dust and Nebula in NGC 2170
Credit & Copyright: Russell Croman (Russell Croman Astrophotography)

Explanation: When stars form, pandemonium reigns. A textbook case is the star forming region NGC 2170. Visible above are red glowing emission nebulas of hydrogen, blue reflection nebulas of dust, dark absorption nebulas of dust, and the stars that formed from them. The first massive stars formed from the dense gas will emit energetic light and winds that erode, fragment, and sculpt their birthplace. And then they explode. The resulting morass is often as beautiful as it is complex. After tens of millions of years, the dust boils away, the gas gets swept away, and all that is left is a naked open cluster of stars.

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  #50  
Παλιά 01-03-07, 09:30
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Rosetta Over Mars
Credit: ESA, Rosetta Mission

Explanation: Panels on ESA's Rosetta spacecraft appear in the foreground of this intriguing image of Mars recorded on February 25 at a range of about 1,000 kilometers. Launched in March 2004, Rosetta was near its closest approach to the Red Planet during a gravity assist flyby maneuver and is ultimately destined to rendezvous with a comet designated 67P/Churyumov-Gerasimenko. Below the comet-chasing spacecraft lies a dark boundary along the martian Syrtis region. But wait ... who took the picture? The picture was actually captured by the imaging system (CIVA) onboard Rosetta's lander, Philae, switched on for testing. The three-legged, box-shaped, 100 kilogram Philae is scheduled to attempt a landing on the comet nucleus after Rosetta's rendezvous in November 2014.

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  #51  
Παλιά 02-03-07, 15:06
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Solar Eclipse from the Moon
Illustration Credit & Copyright: Hana Gartstein

Explanation: Parts of Saturday's (March 3) lunar eclipse will be widely visible. For example, skywatchers in Europe, Africa, and western Asia will be able to see the entire spectacle of the Moon gliding through Earth's shadow, but in eastern North America the Moon will rise already in its total eclipse phase. Of course if you traveled to the Moon's near side, you could see the same event as a solar eclipse, with the disk of our fair planet Earth completely blocking out the Sun. For a moon-based observer's view, graphic artist Hana Gartstein (Haifa, Israel) offers this composite illustration. In the cropped version of her picture, an Apollo 17 image of Earth is surrounded with a red-tinted haze as sunlight streams through the planet's dusty atmosphere. Earth's night side remains faintly visible, still illuminated by the dark, reddened Moon, but the disk of the Earth would appear almost four times the size of the Sun's disk, so the faint corona surrounding the Sun would be largely obscured. At the upper left, the Sun itself is just emerging from behind the Earth's limb.

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  #52  
Παλιά 03-03-07, 07:39
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Lunar Transit from STEREO
Credit: STEREO Project, NASA

Explanation: A million miles from planet Earth, last weekend the STEREO B spacecraft found itself in the shadow of the Moon. So, looking toward the Sun, extreme ultraviolet cameras onboard STEREO B were able to record a stunning movie of a lunar transit (aka solar eclipse), as the Moon tracked across the solar disk. Each frame of the movie is a false-color composite of images made through four different filters that highlight temperature regimes and structures in the upper solar atmosphere. In this frame, large bright active regions, seen as dark sunspots in visible light, flank the Moon's silhouetted disk. The Moon appears small, less than 1/4th the size seen from Earth, because the spacecraft-Moon separation is over four times the Earth-Moon distance. Tonight, the Moon will find itself in planet Earth's shadow in a total lunar eclipse.

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  #53  
Παλιά 04-03-07, 08:33
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Triton: Neptune's Largest Moon
Credit: Voyager 2, http://www.nasa.gov/

Explanation: In October of 1846, William Lassell was observing the newly discovered planet Neptune. He was attempting to confirm his observation, made just the previous week, that Neptune had a ring. But this time he discovered that Neptune had a satellite as well. Lassell soon proved that the ring was a product of his new telescope's distortion, but the satellite Triton remained. The above picture of Triton was taken in 1989 by the only spacecraft ever to pass Triton: Voyager 2. Voyager 2 found fascinating terrain, a thin atmosphere, and even evidence for ice volcanoes on this world of peculiar orbit and spin. Ironically, Voyager 2 also confirmed the existence of complete thin rings around Neptune - but these would have been quite invisible to Lassell!

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  #54  
Παλιά 05-03-07, 08:58
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Illusion and Evolution in Galaxy Cluster Abell 2667
Credit: NASA, ESA, Jean-Paul Kneib (Laboratoire d’Astrophysique de Marseille) et al.

Explanation: What's happening to the galaxies of cluster Abell 2667? On the upper left, a galaxy appears to be breaking up into small pieces, while on the far right, another galaxy appears to be stretched like taffy. To start, most of the yellowish objects in the above image from the Hubble Space Telescope are galactic members of a massive cluster of galaxies known as Abell 2667. The distortion of the galaxy on the upper left is real. As the galaxy plows through the intercluster medium, gas is stripped out and condenses to form bright new knots of stars. This detailed image of ram pressure stripping helps astronomers understand why so many galaxies today have so little gas. The distortion of the galaxy on the far right, however, is an illusion. This nearly normal galaxy is actually far behind the massive galaxy cluster. Light from this galaxy is gravitationally lensed by Abell 2667, appearing much like a distant person would appear through a wine glass. Each distorted galaxy gives important clues about how galaxies and clusters of galaxies evolve.

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  #55  
Παλιά 06-03-07, 08:21
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Saturn from Above
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: This image of Saturn could not have been taken from Earth. No Earth based picture could possibly view the night side of Saturn and the corresponding shadow cast across Saturn's rings. Since Earth is much closer to the Sun than Saturn, only the day side of the planet is visible from the Earth. In fact, this image mosaic was taken in January by the robotic Cassini spacecraft now orbiting Saturn. The beautiful rings of Saturn are seen in full expanse, while cloud details are visible near the night-day terminator divide.

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  #56  
Παλιά 07-03-07, 09:05
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The Trifid Nebula, aka M20, is easy to find with a small telescope and a well-known stop in the nebula rich constellation Sagittarius. But where visible light pictures show the nebula divided into three parts by dark, obscuring dust lanes, this penetrating infrared image reveals filaments of luminous gas and newborn stars.

This spectacular false-color view is courtesy of the Spitzer Space Telescope. Astronomers have used the Spitzer infrared image data to count newborn and embryonic stars that otherwise lie hidden in the natal dust and glowing clouds of this intriguing stellar nursery.

Image credit: NASA, JPL-Caltech, J. Rho (SSC/Caltech)

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Η φωτογραφία σε μεγάλη ανάλυση : http://www.nasa.gov/images/content/1...70_ys_full.jpg
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  #57  
Παλιά 08-03-07, 08:36
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Eclipsed Moon and Stars
Credit & Copyright: Johannes Schedler (Panther Observatory)

Explanation: This dramatic image features a dark red Moon during a total lunar eclipse -- celestial shadow play enjoyed by many denizens of planet Earth last Saturday. Recorded near Wildon, Austria, the picture is a composite of two exposures; a relatively short exposure to feature the lunar surface and a longer exposure to capture background stars in the constellation Leo. Completely immersed in Earth's cone-shaped shadow during the total eclipse phase, the lunar surface is still illuminated by sunlight, reddened and refracted into the dark shadow region by a dusty atmosphere. As a result, familiar details of the Moon's nearside are easy to pick out, including the smooth lunar mare and the large ray crater Tycho. In this telescopic view, the background stars are faint and most would be invisible to the naked eye.

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  #58  
Παλιά 09-03-07, 09:07
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This composite image shows Z Camelopardalis, or Z Cam, a double-star system. The Z Cam system features a collapsed, dead star, called a white dwarf, and its companion star, as well as a ghostly shell around the system. The massive shell provides evidence of lingering material ejected during, and swept up by, a powerful explosion that occurred a few thousand years ago.

The image combines data gathered from the far-ultraviolet and near-ultraviolet detectors on NASA's Galaxy Evolution Explorer on Jan. 25, 2004. The orbiting observatory first began imaging Z Cam in 2003.

Z Cam is the largest white object in the image, located near the center. Parts of the shell are seen as a wispy, yellowish feature below and to the right of Z Cam, and as two large, whitish, perpendicular lines on the left.

Z Cam was one of the first known recurrent dwarf nova, meaning it erupts in a series of small, hiccup-like blasts, unlike classical novae, which undergo a massive explosion.

Image credit: NASA/JPL-Caltech

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Φωτογραφία σε μεγάλη ανάλυση (4.2 mb) εδώ

(Μερικές φορές λόγω μειωμένου ενδιαφέροντος προτιμώ άλλες φωτογραφίες για την διαστημική φωτό της ημέρας απ αυτή που προτείνει η NASA.)
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  #59  
Παλιά 12-03-07, 09:59
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Το astronomy image of the day δεν μας δίνει και πολύ ωραίες φωτο ή δίνει μόνο video που δεν μπορούμεν να αναπαράγουμε.

Αρα ας θυμηθούμε άλλες όμορφες φωτό.



Κλασική φωτογραφία του Αστροναύτη-Κυβερνήτη Eugene A. Cernan από την αποστολή του Apollo 17, οδηγώντας το σεληνιακό αυτοκινητάκι

Image credit: NASA

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Όποιος θα ήθελε αυτή την φωτογραφία σε μεγάλη ανάλυση θα την βρεί εδώ.
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  #60  
Παλιά 13-03-07, 21:26
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Attacking Mars
Credit: M. Di Lorenzo et al., Mars Exploration Rover Mission, Cornell U., JPL, NASA; Courtesy: Aviation Week

Explanation: The Spirit rover attacked Mars again in 2005 September. What might look, above, like a military attack, though, was once again just a scientific one - Spirit was instructed to closely inspect some interesting rocks near the summit of Husband Hill. Spirit's Panoramic Camera captured the rover's Instrument Deployment Device above as moved to get a closer look at an outcrop of rocks named Hillary. The Spirit rover, and its twin rover Opportunity, have now been exploring the red planet for over three years. Both Spirit and Opportunity have found evidence that parts of Mars were once wet.

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