| Ultimi arrivi - A Tribute To Mars Global Surveyor |
Valles_Marineris-MGS.jpgPortion of the Valles Marineris Canyon System (Natural Colors; credits: NASA/MGS/MSSS)89 visitenessun commentoOtt 07, 2004
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Souhern_Emisphere.jpgThe Southern Hemisphere of Mars (Natural Colors; credits: NASA/MGS/MSSS)104 visiteCaption NASA:"The wide angle camera view of Mars shown here was obtained by the Mars Global Surveyor Mars Orbiter Camera in late July 1999, about 1 week before the start of southern Spring. The frosty, retreating south polar cap (white) is seen in the lower quarter of the image and wisps of dust storm clouds (grayish-orange in this view) occur just above the cap at the lower left. The southernmost of the large Tharsis volcanoes, Arsia Mons, is seen at the upper left. Arsia Mons is about 350 Km across".
Ott 07, 2004
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Volcanoes-Olympus_Mons_and_Tharsis_Region.jpgTharsis Region (Natural Colors; credits: NASA/MGS/MSSS)132 visite"Mars Global Surveyor's camera, MOC, provided this hemispheric view of the northern Tharsis region on June 1, 1998. This picture shows the giant volcano, Olympus Mons, and one of the Tharsis Montes volcanoes, Ascraeus Mons. Another volcano, Alba Patera, is lurking under the haze and clouds at the top of the image. Olympus Mons is about 550 Km wide. The terminator - such as the line that divides night and day - was located west of Olympus Mons (left part of the image). It is Winter in the northern hemisphere of Mars and the high latitudes (i.e.: north of Olympus Mons in this picture) exhibit clouds and haze. These clouds most likely contain water ice".
Non possiamo non notare l'enfasi che viene spesso posta, in sede di commento originale alle immagini, sul fatto che le nuvole Marziane "MOLTO PROBABILMENTE" (ossìa "QUASI CERTAMENTE") contengono ACQUA. E allora noi rivolgiamo alla NASA - ancora - la stessa domanda: ma siamo certi che su Marte non piove da qualche milione di anni?
Risposta? Silenzio totale.Ott 07, 2004
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Phobos_from_Mgs-011.jpgMartian Limb and Phobos (Natural Colors; credits: NASA/MGS/MSSS)132 visiteUna spettacolare veduta del bordo ("limb") di Marte e della sua luna "misteriosa", Phobos, la quale costituisce anche uno degli oggetti più "bui" dell'intero Sistema Solare. Ecco il commento originale a questa immagine:
"Phobos is one of the darkest objects in the Solar System. Thus, 4 wide angle images were obtained to make the picture of Phobos over the martian limb: a pair of red and blue wide angle images was acquired for the limb and a pair of separate images were required to see Phobos. The wide angle images illustrate the fact that Phobos is mostly colorless (dark gray); the faint orange/red hue in the wide angle picture is a combination of slight differences in the focal lengths of the blue and red cameras and the orange/red illumination provided by reflection of sunlight off Mars. To a person standing on Phobos, the Red Planet would fill most of the sky". Ott 07, 2004
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Craters-Gusev_Crater-R1300473_474.jpgGusev Crater Landscape from MGS (Extremely Enhanced Natural Colors; credits:NASA/JPL-MSSS)125 visiteSi tratta di un'immagine a colori ad HD semplicemente fantastica, ottenuta dalla Sonda Mars Global Surveyor e relativa (in parte) all'area di lavoro di Spirit. Abbiamo scelto di mostrarVi questo frame per almeno 3 buoni motivi: 1) perchè si tratta di un frame bellissimo; 2) perchè ci fa vedere bene i "colori di Marte" (che, dall'alto, sembrano diversi da quanto ci mostrano le Sonde che stazionano sulla superficie e 3) perchè ci aiuta a cogliere, usando i nostri occhi, la sensazione che proveremmo se ci trovassimo fisicamente su una nave spaziale, in orbita intorno a Marte.Ott 07, 2004
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South_Polar_Regions-Polygons-PIA05951.jpgThe "Martian Polygons" (Original NASA-MGS-MSSS b/w frame)136 visiteThis Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows "polygons" patterned ground in the South Polar region near 82.0°S, 90.8°W. Polygons are fairly common at high latitudes in both Martian hemispheres, but they do not occur everywhere. On Earth, features such as these would be good indicators of the presence and freeze-thaw cycles of ground ice. On Mars, the same might (emphasis on "might") also be true. This image covers an area approximately 3 Km across and is illuminated by sunlight from the upper left. Seasonal frost enhances the contrast in the scene; the darkest areas have advanced the farthest in the springtime defrosting process. Set 22, 2004
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Phobos_from_MGS-000.jpgPhobos from Mars Global Surveyor (1)178 visitePhobos, a quanto pensano gli Scienziati, potrebbe non essere una "luna originale" di Marte. Potrebbe (peraltro verosimilmente) trattarsi di un asteroide 'catturato' da Marte, in epoche remote, mentre transitava nei suoi paraggi. La velocità di rotazione di Phobos è estremamente elevata: questa luna, infatti, completa un'intera orbita intorno a Marte in circa 8 ore. Per quanto attiene, poi, il lato "esteriore" di Phobos, possiamo facilmente notare il grandissimo numero di crateri sulla sue superficie e l'enorme depressione (lo "Stickney Crater") che lo caratterizza in maniera davvero unica.Set 20, 2004
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Martian_Mountains-MGS-00.jpgCharitum Montes (Natural Colors; credits: NASA/MGS/MSSS)203 visiteWhat causes the unusual white color on some Martian Mountains? The answer can be guessed by noticing that the bright areas disappear as springtime takes hold in the South of Mars: dry ice. Dry CO2 ice sublimates directly to gas from its frozen state. The frosty mountains, named "Charitum Montes", have been covered with CO2 ice over the Martian Winter. The serene scene pictured above is not a photograph, but rather a computationally constructed digital illusion resulting from the fusion of two color images from the Mars Orbital Camera and topographic data from the Mars Orbiter Laser Altimeter. Both instruments operate from the Mars Global Surveyor robot spacecraft currently orbiting Mars.Set 16, 2004
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South_Polar_Regions-South_Pole.jpgThe South Pole of Mars (Natural Colors; credits: NASA/MGS/MSSS)197 visiteCaption NASA:"During Spring, the Ice Cap - predominantly formed by layers of frozen carbon dioxide (dry ice) plus some water ice - begins to shrink as the ices change directly from solid to gas (cosiddetta "sublimazione"). Hazy clouds of ice crystals and fog extend across the bottom of the picture and a darker, more defrosted area, is visible at the upper right, near the Red Planet's night side". Set 15, 2004
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North_Polar_Regions-North_Pole.jpgThe North Pole of Mars (Natural Colors; credits: NASA/MGS/MSSS)310 visiteNon ci sono parole sufficienti per descrivere questa meravigliosa immagine ad HD del Polo Nord di Marte ed il volume di dettagli che risultano percepibili è davvero enorme. EccoVi il testo originale di commento al frame:"Spring reached the North Pole of Mars (foto del Maggio 2002) and brought with it the usual dust storms. As the North Polar Cap begins to thaw, a temperature difference occurs between the cold frost region and recently thawed surface, resulting in swirling winds between the adjacent regions. In the above image mosaic from the Mars Global Surveyor spacecraft, the white material is frozen carbon dioxide that covers much of the extreme north. The choppy clouds of at least three dust storms can be identified". Che altro dire???Set 15, 2004
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Craters-Unnamed_Buried_Craters-MGS-PIA06855-00.jpgUnnamed Buried Craters in Utopia Planitia (Original NASA/MGS/MSSS b/w Frame)106 visiteCaption NASA:"This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a cracked Plain in Western Utopia Planitia. The three circular crack patterns indicate the location of three buried Unnamed Impact Craters. These landforms are located near 41,9° North Lat. and 275,9° West Long. The image covers an area approximately 3 km (about 1,9 mi) across. Sunlight illuminates this scene from the lower left".Set 09, 2004
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Cydonia_Region-PIA06845_modest.jpgFeatures of Cydonia Mensae Region (Original NASA/MGS/MSSS b/w Frame)229 visiteCaption NASA:"Dark, windblown Dunes on the Floor of Bamburg Crater, located in the Cydonia Region near 39,7° North Lat. and 3.2° West Long."Set 01, 2004
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