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| Ultimi arrivi - The Universe Inside |
Clouds.jpgIn the Sunset158 visite"...Nessuno può negare, neppure nei momenti più terribili dell'esistenza, che, dietro le nuvole, deve pur sempre esserci il Sole..."Mag 06, 2006
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EASTER ISLAND PLANETS.jpgArt will outlive the Artist87 visite"...Tutta l'Arte che un Artista potrà mai creare, ora usando pietre ed ora usando ferro, sopravviverà - lungamente - al suo Creatore.
E dunque, se questo è vero, nella nostra Arte Mortale ci deve pur essere, in fondo, almeno una particella dell'Eternità..."
P.C. Floegers - "Conversations for Tomorrow"Mag 06, 2006
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Equinox.jpgEquinox137 visiteMag 06, 2006
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SN 1006-1.jpgSN 1006: A New Sun over the Ocean...77 visite...Si tratta soltanto di una - riuscita - ricostruzione/falsificazione, ma il risultato finale è comunque molto bello e ci dimostra, una volta ancora, che se si è capaci di "giocare" con le immagini, si può creare qualsiasi cosa e si può ingannare chiunque...
Caption originale:"A new star, likely the brightest supernova in recorded human history, appeared in planet Earth's sky about 1000 years ago, in 1006 AD. The expanding debris cloud from the stellar explosion is still visible to modern astronomers, but what did the supernova look like in 1006? In celebration of the millennial anniversary of SN1006, astronomer Tunc Tezel offers this intriguing suggestion, based on a photograph he took on February 22, 1998 from a site overlooking the Mediterranean Sea, south of Antalya, Turkey. On that date, bright Venus and a waning crescent Moon shone in the early morning sky. Adopting calculations which put the supernova's apparent brightness between Venus and the crescent Moon, he digitally superposed an appropriate new star in the picture. He placed the star at the supernova's position in the southerly constellation of Lupus and used the water's reflection of moonlight in the final image".Apr 30, 2006
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Skylab-1973.jpgThe "unforgettable" Skylab...80 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".Apr 29, 2006
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CloudsandClouds.jpgClouds and Clouds101 visiteThe clouds in the foreground are much different than the clouds in the background. In the foreground are a photogenic deck of Earth-based water clouds. The long exposure used to create the above photograph makes the light from the left, reflected from Phoenix, Arizona, USA, appear like a sunset. Far in the distance, however, are star clouds from the disk of our Milky Way Galaxy. Billions of stars like our Sun live there, circling our Galactic center every 200 million years. Contrast between the water clouds and the star clouds has been digitally enhanced. Between the two, visible on the upper right, is the planet Jupiter.Apr 24, 2006
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Railway to the Moon.jpgLet's go to the Moon!...121 visite"...Ricordati che la Strada che porta al Cielo, passa sempre per questa Terra..."
P.C. Floegers - "Memories"Apr 18, 2006
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Sun Halo-2.jpgBright Sun, Dark Sky60 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 è affatto naturale.
Esso è molto scuro, di colore incerto (grigio), molto simile al cielo di Marte (come si vede nei frames NASA). Ma perchè 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 più 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 è che il fatto di credere a quello che si vede in una fotografia (terrestre, marziana o lunare) e commentarlo, sta diventando sempre più una questione di "Fede" e non - purtroppo - di effettiva oggettività.Apr 11, 2006
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Umbra Fugax-1.jpgUmbra Fugax83 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". Apr 08, 2006
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Aurora Borealis - Norway.jpgBlack Aurora over Norway74 visiteDa "NASA - Picture of the Day" del 29 Marzo 2006:"What causes gaps between aurora curtains? These unusual gaps can make auroral displays appear more detailed and intricate. Research using data from four Cluster Spacecraft orbiting the Earth has likely found the secret: auroral gaps, sometimes knows as "black auroras", are actually anti-auroras. In normal auroras, electrons and/or predominantly negatively charged particles fall toward Earth along surfaces of constant magnetic field. They ionize the Earth's atmosphere on impact, causing the bright glows. In auroral gaps, however, negatively charged particles may be sucked out from the Earth's ionosphere along adjoining magnetic field lines. These dark anti-auroras can climb to over 20.000 Km and last for several minutes. Pictured above, a series of well-defined auroral gaps is seen dividing green aurora curtains high above Harstad, Norway, earlier this month".Apr 02, 2006
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Super-Earths.jpgSuper-Earths?96 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 (...)". Mar 20, 2006
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South Polar Halo.jpgSouth Polar Halo58 visiteWhen Sunlight reflects and refracts off of tiny ice crystals in the atmosphere, the result can be ice crystal halos, which are related to rainbows (the latter being produced when Sunlight reflects and refracts from water droplets).
In Antarctica the temperatures are cold and the air is dry, so snow crystals grow very slowly. This slow growth tends to produce very clean hexagonal prisms, which are well suited for producing beautiful atmospheric displays. The example here is a South Pole halo, showing a rich variety of arcs and halos.
Halos arise from the way minute ice crystals in the atmosphere scatter Sunlight (or Moonlight!) into different angles.
The quality of a halo depends on the type and quality of the ice crystals that produce it. Mar 05, 2006
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