| Piú votate - The Universe Inside |
Aurora_Borealis_-_01.jpgRed Space-Waterfall56 visitenessun commentoMareKromium
(10 voti)
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Aurora_Borealis_-_02.jpgPeaceful Morning Sky65 visitenessun commentoMareKromium
(10 voti)
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Aurora_Borealis_-_04.jpgPurple (light's) Rain...55 visiteSi tratta della stessa fotografia mostrataVi nel quadro precedente ma, questa volta, è in "colori autentici" (almeno a nostro parere...).MareKromium
(10 voti)
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Starfield.jpgStarfield...55 visitenessun commento
(10 voti)
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Never Alone.jpgNever Alone...66 visitenessun commento
(10 voti)
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Umbra Fugax-1.jpgUmbra Fugax85 visiteSiamo al termine della spettacolare eclissi totale del 29 Marzo 2006 e l'ombra della Luna sta già lasciando il posto al Sole. Se osservate il frame a schermo pieno e con una certa attenzione dovreste riuscire a notare che, in alcune zone del cielo - già quasi del tutto libere dalla "notte" - si intravedono ancora dei corpi luminosi puntiformi che, ad una prima e sommaria occhiata, potrebbero sembrare delle stelle molto luminose che stanno per svanire nella luce del giorno. Ma non è così: si tratta, a nostro parere, di un abbastanza consueto e caratteristico photoartifact.
In ogni caso, un frame davvero molto bello.
Caption originale:"During the March 29, 2006 total Solar Eclipse, the Moon's dark central shadow (or "umbra") is vanishing beyond the horizon in this dramatic view of the landscape a few km South-East of Incesu, Anatolia, Turkey. The large, snow covered mountain in the distance is 3.250 mt high volcano Hasan Dag. The foreground is growing brighter as eclipse watchers are just beginning to see rays of sunlight peek around the lunar limb, while the mountains on the horizon, left of Hasan Dag, are still completely shadowed by the Moon. For the watchers along this part of the shadow track, the total phase of the eclipse lasted less than 4', as the umbra raced over them at more than 3000 Km per hour".
(10 voti)
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Sun Pillars.jpgLight Pillars' Parade77 visiteDa "NASA - Picture of the Day" del 5 Marzo 2006:"How can an aurora appear so near the ground? Pictured above are not aurora but nearby light pillars, a local phenomenon that can appear as a distant one. In most places on Earth, a lucky viewer can see a Sun-pillar, a column of light appearing to extend up from the Sun caused by flat fluttering ice-crystals reflecting sunlight from the upper atmosphere. Usually these ice ice crystals evaporate before reaching the ground. During freezing temperatures, however, flat fluttering ice crystals may form near the ground in a form of light snow, sometimes known as a crystal fog. These ice crystals may then reflect ground lights in columns not unlike a Sun-pillar. In the above picture, the colorful lights causing the light pillars surround a ice-skating ring in Fairbanks, Alaska".
(10 voti)
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Moon and Companions~2.jpgHappy New Year from the Moon and Venus71 visiteDa "NASA - Picture of the Day" del 4 Gennaio 2006:"Fading sunlight, a young crescent Moon, and brilliant Venus shared the Western Sky in this view of 2005's final sunset from the top of Mount Haleakala, on Maui, Hawaii. Also known as the Sacred House of the Sun, Haleakala, is Maui's dormant volcano.
At 10.000 feet, the Summit is an ideal site for astronomical observatories, and this scene also features the silhouette of the Northern Hemisphere Faulkes Telescope. It can be of particular interest to students the fact that the Faulkes Telescope (a 2-meter diameter instrument, dedicated to astronomy education), can be remotely operated over the internet.
The Project is a joint effort between the Dill Faulkes Educational Trust and the University of Hawaii - Institute for Astronomy (...)".
(10 voti)
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ZZ-ZZ-ZZ-Venus, Mercury and Saturn.jpgVenus, Mercury and Saturn from Cerro Paranal (Chile)80 visiteDa "NASA - Picture of the Day" del 17 Agosto 2005:"Very bright planets and very large telescopes are part of this sunset view of Paranal Observatory. The observatory's four, massive 8,2 meter telescope units are situated on top of the 2.600 meter high mountain, Cerro Paranal, in the dry Atacama Desert in northern Chile. The individual unit telescopes can be used separately or in combination and are named Antu, Kueyen, Melipal and Yepun. Together they are fittingly known as the European Southern Observatory's Very Large Telescope. Of course, the very bright planets are Venus (near center), joined by Mercury (below) and Saturn (left) in late June's western evening skies".
(10 voti)
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ZZ-ZZ-ZZ-ZZ-LunarAnalemma_richins_f.jpgMoon's analemma (New Mexico)167 visiteDa "NASA - Picture of the Day" del 13 Luglio 2005:"An analemma is an 8-like curve that is gotten when you mark the position of the Sun at the same time each day for 1 year. To imaging an analemma of the Moon it is necessary to understand that, on average, the Moon returns to the same position in the sky about 51' later each day. So, photographing the Moon 51' later on successive days, over one lunation (or Lunar month) it will trace out an analemma-like curve as the actual position of the Moon wanders compared to the average - due to the Moon's tilted and elliptical orbit. (...) Multiple exposure image required some digital manipulation, particularly to include thin crescent phases in daytime skies".
(10 voti)
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ZZ-ZZ-ZZ-Venus_Co_.jpgVenus, Mercury and Saturn from Brighton (Australia)88 visiteDa "NASA - Picture of the Day" del 2 Luglio 2005:"On Tuesday, June 28th, the setting Sun flooded the horizon with a beautiful warm light in this view from the beach beside the pier at Brighton in Adelaide, South Australia. The Sun also illuminated 3 planets gathered in the Western Sky, such as Mercury, Venus and Saturn. From this perspective Mercury is at the highest point in the celestial triangle, brilliant Venus is just below, and Saturn stands farther to the left and below the close pair. Of course, the Planets only appear close together on the sky but are actually quite far apart in space. The orbits of Mercury and Venus are both interior to Earth's orbit, while gas giant Saturn lies in the outer Solar System, over 9 AU from the Sun. Late next week, Venus and Mercury will share Western Skies with the young crescent Moon".
(10 voti)
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ZZ-Sun Halo.jpgA Sun "Halo" in Tennessee79 visiteDal "NASA - Picture of the Day" del 9 Marzo 2005:"Sometimes it looks like the Sun is being viewed through a large lens. In the above case there are actually millions of lenses: ice crystals. As water freezes in the upper atmosphere, small, flat, six-sided, ice crystals might be formed. As these crystals flutter down, much time is spent with their faces flat, parallel to the ground. An observer may pass through the same plane as many of the falling ice crystals near sunrise or sunset. During this alignment, each crystal can act like a miniature lens, refracting sunlight into our view. Dramatically visible behind neighborhood houses and trees and above the cloud deck is the 22° halo created by sunlight reflecting off of atmospheric ice crystals".
L'alone è spiegato in modo preciso ed accurato, ma esso non è l'unico fenomeno visibile in questa foto: alla Vostra Sx si vedono - e bene! - 2 scie chimiche. E quelle come le spieghiamo? Vapori e cristalli?!?
(10 voti)
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