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Japetus-PIA07002_modest.jpgJapetus' surface composition (organic material?!?)59 visiteCaption NASA originale:"The three colors used in the mosaic correspond to 1.01, 3.21, and 3.80 microns. The different colors represent vastly different surface compositions. The upper bright blue region is rich in water ice, while the lower, dark brown region is composed mainly of a substance rich in organic material. The yellow region consists of a mixture of ice and organics, suggesting a gradual change in composition on the surface. This pattern suggests Iapetus swept up the dark material, which may have come from debris created from meteoritic impacts onto the small, outer satellites of Saturn".
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Triton-PIA00317_modest.jpgTriton (False Colors; credits: NASA/JPL/USGS)59 visiteCaption NASA originale:"The color was synthesized by combining HR images taken through orange, violet and ultraviolet filters; these images were displayed as red, green and blue images and combined to create this color version. With a radius of 1.350 Km, about 22% smaller than Earth's Moon, Triton is by far the largest satellite of Neptune. It is 1 of only 3 objects in the Solar System known to have a nitrogen-dominated atmosphere (the others are Earth and Saturn's giant moon, Titan). Triton has the coldest surface known anywhere in the Solar System (38 K, about -391 degrees F); it is so cold that most of Triton's nitrogen is condensed as frost, making it the only satellite in the Solar System known to have a surface made mainly of nitrogen ice. The pinkish deposits constitute a vast south polar cap believed to contain methane ice, which would have reacted under sunlight to form pink or red compounds. The dark streaks overlying these pink ices are believed to be an icy and perhaps carbonaceous dust deposited from huge geyser-like plumes, some of which were found to be active during the Voyager 2 flyby. The bluish-green band visible in this image extends all the way around Triton near the equator; it may consist of relatively fresh nitrogen frost deposits. The greenish areas includes what is called the cantaloupe terrain, whose origin is unknown, and a set of "cryovolcanic" landscapes apparently produced by icy-cold liquids (now frozen) erupted from Triton's interior".
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Titan-Surface-31.pngFirst real color view of Titan59 visiteCaption ESA originale:"This image was returned yesterday, 14 January 2005, by ESA's Huygens probe during its successful descent to land on Titan. This is the coloured view, following processing to add reflection spectra data, gives a better indication of the actual colour of the surface. Initially thought to be rocks or ice blocks, they are more pebble-sized. The two rock-like objects just below the middle of the image are about 15 cm(left) and 4 cm (centre) across respectively, at a distance of about 85 cm from Huygens. The surface is darker than originally expected, consisting of a mixture of water and hydrocarbon ice. There is also evidence of erosion at the base of these objects, indicating possible fluvial activity".
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Neptune-clouds-PIA00047_modest.jpgThe clouds of Neptune (b/w) - 159 visiteCaption NASA originale:"The bright cirrus-like clouds of Neptune change rapidly, often forming and dissipating over periods of several to tens of hours. In this sequence Voyager 2 observed cloud evolution in the region around the Great Dark Spot (GDS). The surprisingly rapid changes which occur separating each panel shows that in this region Neptune's weather is perhaps as dynamic and variable as that of the Earth. However, the scale is immense by our standards - the Earth and the GDS are of similar size... - and in Neptune's frigid atmosphere, where temperatures are as low as 55 degrees Kelvin (-360 F), the cirrus clouds are composed of frozen methane rather than Earth's crystals of water ice".
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Mimas-N00026522.jpgMimas: the Ring-Master59 visitenessun commento
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Comets-Wild_2-04.jpgThe map of Comet Wild 259 visiteUna mappa - non particolarmente dettagliata ma comunque idonea a farci vedere e riconoscere le aree maggiormente importanti - della Cometa Wild 2. La mappa in oggetto è stata ottenuta sulla base delle riprese della cometa effettuate dalla Sonda "Stardust" il 2 Gennaio 2004 e, in particolare, impiegando il frame che Vi mostriamo nel quadro successivo.
I nomi indicati per le diverse aree di Wild 2 sono quelli utilizzati dallo "Stardust Team".
Da notare, infine, che il "bacino Shoemaker" potrebbe (a dispetto delle apparenze) NON aver avuto origine da un impatto.
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Comets-Wild_2-03.jpgSome surface features of Wild 259 visiteCaption NASA originale:"These images taken by NASA's Stardust spacecraft highlight the diverse features that make up the surface of comet Wild 2. The three pictures on the left side show a variety of small pinnacles and mesas seen on the limb of the comet. The picture on the right shows the location of a 2-Km (1,2-mile) series of aligned scarps, or cliffs, that are best seen in the stereo images".
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Saturn-N00027023.jpgSomething is moving: is it a moon or a spaceship? (2)59 visiteDa questo secondo frame riusciamo a cogliere, proprio sulla linea del terminatore del corpo luminoso, un rilievo che ci fa optare in maniera decisa verso l'ipotesi "luna di Saturno mossa" (Mimas, probabilmente). Si tratta, come avrete capito, di un esercizio: ogni immagine che vediamo e che esaminiamo può nascondere qualche enigma: scoprirlo ed interpretarlo è il lavoro di ogni Anomaly Hunter. Però è anche vero che tanti enigmi nascono a seguito di errori, malintesi e/o vere e proprie carenze di dati ed informazioni utili. Questa serie di tre frames - che è comunque curiosa ed interessante - è un esempio di come sia facile credere di vedere ET!...
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Titan-Islands-IMG001328-br500.jpgBright white Islands59 visiteCaption NASA originale:"(...) flow around bright 'islands'. The areas below and above the bright islands may be at different elevations". Riprendendo quanto dicevamo in sede di commento al frame precedente, una teoria abbastanza "esotica" - ma da non scartare aprioristicamente - ci dice che la superficie di Titano si è scaldata in epoche (relativamente) remote a seguito di un violentissimo impatto il quale, pur sconvolgendo il pianeta, ha prodotto non solo calore sufficiente a mantenere Titano "caldo" per ere, ma lo ha pure "geologicamente risvegliato".
Dunque su Titano, in accordo a questa teoria, dovremmo trovare svariate fornaci vulcaniche attive, sia superficiali, sia sotterranee. Questo, forse, è il segreto della "vitalità" di Titano.
Purtroppo, come Vi accennavamo, non abbiamo ancora nessuna prova per dare sostanza a questa teoria ma, in fondo, ogni scoperta nasce da un'ipotesi e questa specifica ipotesi, secondo noi, è azzardata, ma NON inverosimile (fonte: ESA).
Voi che ne dite?
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Titan-Huygens_Landing_Site-06.jpgThe "Landing Site": a new best estimate59 visiteCaption NASA originale:"A view of Titan from the visual and infrared mapping spectrometer instrument on the Cassini orbiter. The Huygens probe landed in the small red circle on the boundary of the bright and dark regions. The size of the circle shows the field of view of the Huygens Descent Imager/Spectral Radiometer (DISR) instrument from an altitude of 20 Km (about 12 miles)".
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Saturn-W00004086.jpgA look at the Saturn's System59 visiteSaturno in compagnia di 4 Lune Maggiori (siamo abbastanza certi che 3 delle 4 lune visibili siano Rhea, Mimas e Dione) ed almeno altre 5 o 6 Lune Minori (non crediamo che i piccoli punti luminosi che circondano gli Anelli di Saturno in questo frame siano degli artefatti fotografici).
Un'immagine sovraesposta ma splendida: da collezione!
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27-Farside-Luna3~0.jpgThe first - noisy - close-up of the Far-Side of the Moon from "Luna 3"59 visiteCaption NASA originale:"This close up view taken with the narrow angle camera shows the far side has fewer maria (the dark areas) than the near side. This image is centered at 17° N, 110° E, the dark region below and left of center is Mare Smythii, the bright crater above and left of center is Giordano Bruno. North is up (Luna 3-6)".
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