| Ultimi arrivi - The Universe Inside |
Peace_of_mind.jpgPeace of Mind72 visiteMareKromiumNov 15, 2006
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ZQ-MercuryTransit.jpgThe "Transit" of Mercury99 visiteDa "NASA - Picture of the Day" del 14-11-2006:" What's that dot on the Sun? If you look closely, it is almost perfectly round. The dot is the result of an unusual type of solar eclipse that occurred last week. Usually it is the Earth's Moon that eclipses the Sun. Last week, for the first time in over three years, the planet Mercury took a turn. Like the approach to New Moon before a solar eclipse, the phase of Mercury became a continually thinner crescent as the Planet progressed toward an alignment with the Sun. Eventually the phase of Mercury dropped to zero and the dark spot of Mercury crossed our parent star. The situation could technically be labeled a Mercurian Annular Eclipse with an extraordinarily large ring of fire. From above the cratered planes of the night side of Mercury, the Earth appeared in its fullest phase. Hours later, as Mercury continued in its orbit, a slight crescent phase appeared again. The next Mercurian solar eclipse will occur in 2016". MareKromiumNov 14, 2006
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SOL694-2P187972203EFFAKBAP0050L7M1~0.jpgDawn on Mars79 visitenessun commentoNov 05, 2006
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Starfield.jpgStarfield...71 visitenessun commentoNov 05, 2006
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SPACEVISION-P-019-05703.jpgSpace-Vision74 visiteNov 05, 2006
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MoonIllusion.jpgThe rise of a Dream...75 visiteNov 04, 2006
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ZZ-ZZ-ZZ-Venus_and_the_Moon.jpgCrescent Venus and crescent Moon from Budapest87 visiteDa "NASA - Picture of the Day" del 30 Ottobre 2006:"There's something behind these clouds. Those faint graceful arcs, upon inspection, are actually far, far in the distance. They are the Earth's Moon and the planet Venus.
Both the Moon and Venus are bright enough to be seen during the day, and both are quite capable of showing a crescent phase. To see Venus, which appears quite small, in a crescent phase requires binoculars or a telescope.
In the above dramatic daytime image taken from Budapest, Hungary, the Moon and Venus shared a similar crescent phase a few minutes before the Moon eclipsed the larger but more distant world.
About an hour later, Venus reappeared". Ott 31, 2006
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DAWN.jpgThe Dawn of Man115 visiteUn fotogramma storico, dall'indimenticabile "2001 - A Space Odyssey": l'Alba dell'Uomo.Ott 22, 2006
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FL-Anticrepuscolar Rays.jpgInfinite83 visiteCaption NASA originale:"(...) 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 around from the Sun, they are referred to as anticrepuscular rays (...)". Set 17, 2006
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Over Titan_s Clouds.jpgOver-clouds97 visitenessun commentoSet 15, 2006
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Polar Flash.jpgPolar "Flash"90 visitenessun commentoSet 15, 2006
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Vortex.jpgInside the Vortex...78 visiteFix your camera to a tripod, lock the shutter open, and you can make an image of star trails - graceful concentric arcs traced by the stars as planet Earth rotates on its axis. Of course, the length of the star trails will depend on the exposure time. While exposures lasting just five minutes produce a significant arc, in about 12 hours a given star would trace out half a circle. But in any long exposure, the background glow from light-polluted skies can build up to wash out the trails. Still, astronomer Josch Hambsch produced this stunning composite of star trails around the South Celestial Pole with an effective "all night" exposure time of almost 11 hours. To do it, he combined 128 consecutive five minute long digital exposures recorded in very dark night skies above Namibia. In his final image, the background glow on the right is due in part to the faint, arcing Milky Way.Set 15, 2006
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