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ZZ-ZZ-ZZ-Venus_and_the_Moon.jpgCrescent Venus and crescent Moon from Budapest61 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 Man87 visiteUn fotogramma storico, dall'indimenticabile "2001 - A Space Odyssey": l'Alba dell'Uomo.Ott 22, 2006
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FL-Anticrepuscolar Rays.jpgInfinite62 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-clouds69 visitenessun commentoSet 15, 2006
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Polar Flash.jpgPolar "Flash"57 visitenessun commentoSet 15, 2006
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Vortex.jpgInside the Vortex...61 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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Lunar Eclipse.jpgLunar Eclipse over England65 visiteDa "NASA - Picture of the Day", dell'11 Settembre 2006:"Last Thursday - Sept., 7th, 2006 -, part of our Moon turned dark. The cause, this time, was not a partial lunar phase - the Moon was full - but rather that part of the Moon went into Earth's shadow. The resulting Partial Lunar Eclipse was visible from the Eastern Atlantic Ocean through Europe, Africa and Asia and into the Western Pacific Ocean. The darkest part of the Lunar Eclipse, when part of the Moon was completely shielded from Sunlight, lasted about 90 minutes.
Pictured here, a partially eclipsed Moon is seen rising over an estate in Huddersfield, England. The above image was taken far away from the house in the foreground, as only this would allow it to appear as angularly small as the half-degree Moon far in the background. A setting twilight Sun lit the foreground. The next eclipse of the Moon will occur in March 2007".Set 11, 2006
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Aurora.jpgGreen Aurora74 visiteDa "NASA - Picture of the Day" del 6 Settembre 2006:"What if your horizon was green? If you've got a camera, take a picture! That was the experience of Jeff Hapeman last week when visiting the Pictured Rocks National Lakeshore in Michigan. On a quiet night toward the Northern Horizon over Lake Superior was a long lasting diffuse green aurora. The above image was taken in an effort to capture the sense of wonder one gets when watching an auroral display. Auroras are sparked by energetic particles from the Sun impacting the magnetic environment around the Earth. Resultant energetic particles such as electrons and protons rain down near the Earth's poles and impact the air. The impacted air molecules temporarily lose electrons and when oxygen molecules among them reacquire these electrons, they emit green light. Auroras are known to have many shapes and colors".Set 09, 2006
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Dreaming Together.jpgFirst Dream and Today's Reality73 visitenessun commentoSet 08, 2006
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M 31 and Hale Bopp.jpgTemporary Sky...60 visiteDa "NASA - Picture of the Day" del 13 Agosto 2006:"The Moon almost ruined this photograph. During late March and early April 1997, Comet Hale-Bopp passed nearly in front of the Andromeda Galaxy.
Here the Great Comet of 1997 and the Great Galaxy in Andromeda were photographed together on 1997 March 24th. The problem was the brightness of the Moon. The Moon was full that night and so bright that long exposures meant to capture the tails of Hale-Bopp and the disk of M31 would capture instead only moonlight reflected off the Earth's atmosphere. By the time the Moon would set, this opportunity would be gone. That's why this picture was taken during a total lunar eclipse".Ago 13, 2006
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Perseid-2.jpgShooting Star (2) - detail mgnf65 visiteOsservate questo ingrandimento della Perseide immortalata dal nostro Amico Jimmy Westlake e poi provate a riguardare il (presunto) bolide che Cassini potrebbe aver fotografato nello Spazio di Saturno: noterete con semplicità che le caratteristiche delle due "strisciate di luce" (streaks) sono MOLTO simili.
Peccato che la NASA si affanni a dare credito solo ad alcuni personaggi e ad alcune (sempre più discutibili o insulse) "scoperte" (come il presunto colorito "rosato" di Iperione), senza mai prendere atto che anche in Italia esistono Ricercatori attenti e competenti i quali, di tanto in tanto, sono i primi a notare l'esistenza di qualcosa di veramente raro...
Peccato.Ago 11, 2006
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Perseid-1.jpgShooting Star (1)65 visiteL'immagine è sicuramente bella, ma quello che vorremmo farVi notare è la tessitura della striscia lasciata dalla "stella cadente" la quale, come ben si vede (anche senza operare ingrandimenti), contiene "nodi" (modesti rigonfiamenti dovuti, probabilmente, a perdita/consunzione di materiale a seguito dell'attrito durante la caduta del frammento di Corpo Celeste attraverso l'atmosfera) e "brillamenti" (delle vere e proprie "fiammate" che si avviano, di regola, in corrispondenza dei "nodi" e che indicano cambi di temperatura - ergo di luminosità - del Corpo in questione).Ago 11, 2006
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