| Piú votate - The Universe Inside |
Puzzle-Cook.jpgOne piece after another...74 visite"...Ed alla fine non restano che ricordi.
Sorrisi, lacrime, sensazioni di caldo e di freddo.
L'ultimo - e più prezioso - patrimonio che non potrò mai lasciare in eredità: la mia Memoria…"
P.C. Floegers - "Conversations for Tomorrow"MareKromium
(15 voti)
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The_Moon.jpgThe Hunter's Moon...74 visite"...Caelum, avarus, in coeno quaerit..."
(Binder)
"...L'avaro (inteso anche come chi "moralmente misero") cerca il Cielo nel fango..."MareKromium
(15 voti)
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Peace_of_mind.jpgPeace of Mind69 visiteMareKromium
(15 voti)
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Vortex.jpgInside the Vortex...77 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.
(15 voti)
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Aurora.jpgGreen Aurora97 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".
(15 voti)
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Dreaming Together.jpgFirst Dream and Today's Reality87 visitenessun commento
(15 voti)
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M 31 and Hale Bopp.jpgTemporary Sky...75 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".
(15 voti)
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In The Sunset.jpgRed, red Sunset...83 visitenessun commento
(15 voti)
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EASTER ISLAND PLANETS.jpgArt will outlive the Artist105 visite"...Tutta l'Arte che un Artista potr mai creare, ora usando pietre ed ora usando ferro, sopravviver - lungamente - al suo Creatore.
E dunque, se questo vero, nella nostra Arte Mortale ci deve pur essere, in fondo, almeno una particella dell'Eternit..."
P.C. Floegers - "Conversations for Tomorrow"
(15 voti)
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Skylab-1973.jpgThe "unforgettable" Skylab...93 visiteDa "NASA - Picture of the Day", del 29 Aprile 2006:"Skylab was an orbiting laboratory launched by NASA in May 1973. Skylab, pictured above, was visited 3 times by NASA Astronauts who sometimes stayed as long as two and a half months. Many scientific tests were performed on Skylab, including astronomical observations in ultraviolet and X-ray light. Some of these observations yielded valuable information about Comet Kohoutek, our Sun and about the mysterious X-ray Background Radiation that (apparently) comes from all over the sky.
Skylab fell back to Earth on July, 11, 1979".
(15 voti)
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Sun Halo-2.jpgBright Sun, Dark Sky77 visiteCaption originale:"Have you ever seen a halo around the Sun? This fairly common sight occurs when high thin clouds containing millions of tiny ice crystals cover much of the sky. Each ice crystal acts like a miniature lens. Because most of the crystals have a similar elongated hexagonal shape, light entering one crystal face and exiting through the opposing face refracts 22 degrees, which corresponds to the radius of the Sun Halo. A similar Moon Halo may be visible during the night. The picture was taken in Gunlock, Utah, USA. A flock of birds was caught by chance in the foreground. Exactly how ice-crystals form in clouds remains under investigation".
Nota: si tratta di un'immagine molto bella, senza alcun dubbio, ma una piccola annotazione va fatta. Vedete il colore del cielo attorno al Sole? Vi sembra naturale? No, ovviamente: non affatto naturale.
Esso molto scuro, di colore incerto (grigio), molto simile al cielo di Marte (come si vede nei frames NASA). Ma perch questo "strano cielo" anche sulla Terra? Diciamo che si tratta di una combinazione di fattori (su tutti il - probabile - filtro/colore usato e la circostanza per cui, scattando foto come questa e quindi sovraesponendo il Sole, automaticamente si rende pi scuro tutto il resto del paesaggio).
Morale: se non si vedessero degli uccelli in transito, questa bella immagine potrebbe tranquillamente rappresentare un tramonto (o un'alba) su Marte.
La nostra deduzione che il fatto di credere a quello che si vede in una fotografia (terrestre, marziana o lunare) e commentarlo, sta diventando sempre pi una questione di "Fede" e non - purtroppo - di effettiva oggettivit.
(15 voti)
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Super-Earths.jpgSuper-Earths?115 visiteda "NASA - Picture of the Day" del giorno 20 Marzo 2006:"Are Super-Earths common around other star systems? Quite possibly. Unexpected evidence for this came to light recently when a planet orbiting a distant star gravitationally magnified the light of an even more distant star. Assuming the planet's parent star is normal red dwarf, the brightening is best explained if the planet is about 13 times the mass of the Earth and orbiting at the distance of the asteroid belt in our own Solar System. Given the small number of objects observed and similar determinations already obtained for other star systems, these super-Earths might be relatively common. Astronomers speculate that the planet might have grown into a Jupiter-sized planet if its star system had more gas. Since the planet was not observed directly, significant uncertainty remains in its defining attributes and future research will be aimed at better understanding this intriguing system (...)".
(15 voti)
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