| Piú viste - A Tribute To Mars Global Surveyor |
Dunes-S2200554sub-01.jpgMigrating Dunes (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team))169 visiteCaption NASA originale:"This MGS-MOC image shows a suite of dunes in one of the several North Polar Dune Fields. The bright surfaces adjacent to some of the dunes are patches of frost. These dunes spend much of the Autumn, Winter, and Spring seasons covered with CO2 frost. Only in late Spring and in Summer are the dark windblown sands fully exposed.
Over the course of the 9+ years of the MGS mission, the MOC team has sought evidence that sand dunes may be migrating downwind over time. However, no clear examples of the movement of a whole dune have been identified. On Earth, such movement is typically detectable in air photos of the smallest active dunes over periods of a few years. Owing to the fact that the North Polar Dunes spend much of each Martian Year under a cover of frost, perhaps these move much more slowly than their frost-free, terrestrial counterparts. The sand may also be somewhat cemented by ice or minerals, likewise preventing vigorous dune migration in the present environment.
This view covers an area approximately 3 km (1.9 mi) wide and is illuminated by sunlight from the lower left. The dunes are located near 79.8°N, 127.1°W, and the picture was acquired on 11 September 2006.MareKromium
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North_Polar_Features-North_Polar_Scarp-MGS-01.jpgNorth Polar Panorama (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)169 visiteCaption NASA originale:"This MGS-MOC image shows a steep slope in the North Polar Region of Mars. The stripes indicate an exposure of layered material; the variations in brightness among the stripes are the result of varying amounts and textures on seasonal Carbon Dioxide (CO2) frost. At the time the image was acquired - such as in June 2006 -, the Carbon Dioxide frost was beginning to sublime way, leaving a variety of different patterns in frost distribution".
Location near: 85,2° North Lat. and 122,7° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Spring MareKromium
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Craters-Newton_Crater-03.jpgNewton Crater's Gullies (Original NASA/MGS/MSSS b/w Frame)167 visiteDa "NASA - Picture of the Day" del 26.6.2000:"...Inside a small crater that lies inside large Newton Crater on Mars, numerous narrow channels run from the top down to the crater floor. The above picture covers a region spanning about 3000 meters across. These and other gullies have been found on Mars in recent HR pictures taken by the orbiting Mars Global Surveyor robot spacecraft. Similar channels on Earth are formed by flowing water, but on Mars the temperature is normally too cold and the atmosphere too thin to sustain liquid water. Nevertheless, many scientists now hypothesize that liquid water did burst out here from underground Mars, eroded the gullies and pooled at the bottom as it froze and evaporated. If so, life-sustaining ice and water might exist even today below the Martian surface (...)". L'idea che ci sia acqua allo stato liquido sotto la superficie di Marte non è nuova, anzi: la NASA stessa lo ipotizzava 4 anni fa. Oggi, dopo mesi di esplorazione "in loco", tutto tace. Forse un ripensamento?
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Martian_Limb-MGS-E23-00100_limb-00.jpgMartian Limb and Outer Space (Original NASA/MGS/MSSS b/w Frame)165 visitecaption originale: "The Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) red and blue wide angle cameras provide daily coverage of the Red Planet "from Limb to Limb." The "Limbs" are the edges of the Planet as seen to the West and East of the spacecraft. Depending on weather conditions, Clouds or Haze can sometimes be seen above the Limb. This picture was taken by the blue camera in December 2002. It is an oblique view looking Westward across heavily Cratered Terrain at High Southern Latitudes. A thin line of Haze, high in the Martian Atmosphere, can be seen above the Planet's Surface. The view of Craters in the foreground is enhanced by the presence of bright, winter-time CO2 Frost. The darkness above the Limb is outer space".
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Dunes-Dark_Dunes-Noachis_Terra-PIA07351-01.jpgDark Dunes in Noachis Terra (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)165 visiteCaption NASA originale:"This MGS-MOC image shows low albedo Sand Dunes on the Floor of an Unnameed Crater in Southern Noachis Terra".
Location near: 52.5° South Lat. and 336.9° West Long.
Image width: ~3,0 Km (~1,9 mi)
Illumination from: upper left
Season: Southern AutumnMareKromium
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Craters-Unnamed_Craters-Utopia_Planitia-01.jpgOld Buried Unnamed Craters in Northern Utopia Planitia (Natural Colors; credits for the additonal process. and color.: Dr Paolo C. Fienga - Lunexit Team)165 visiteOriginal caption:"This MGS-MOC image shows 2 circular features on the Plains of Northern Utopia. A common sight on the Martian Northern Plains, these rings indicate the locations of Buried Impact Craters".
Location near: 65,1° North Lat. and 261,2° West Long.
Image width: ~2 Km (~1,2 mi)
Illumination from: lower left
Season: Northern SummerMareKromium
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Channels-Unnamed_Channel_in_Stygis_Catena-PIA07133-01.jpgAncient Riverbed in Stygis Catena (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)163 visiteCaption NASA originale:"This MGS-MOC image shows a Trough (Trough ---> canale) in the Stygis Catena Region, East of the Martian Volcano Elysium Mons. The Trough probably formed by collapse (Collapse ---> geol. "cedimento" del terreno). Large, dark Boulders can be seen on the Trough Floor in this Volcanic Region. The image is located near 24,4° North Lat. and 210,4° West Long. The image covers an area about 3 km (approx. 1,9 mi) wide and sunlight illuminates the scene from the lower left".MareKromium
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Craters-Kaiser_Crater-PCF-LXTT-01.jpgKaiser Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 160 visiteOriginal caption:"As the MGS Primary Mission drew to an end, the Southern Hemisphere of Mars was in the depths of Winter. At high latitudes, it is dark most - if not all - of the day. Even at middle latitudes, the Sun shines only thinly through a veil of Water and Carbon Dioxide Ice Clouds and the ground is so cold that Carbon Dioxide Frosts have formed. Kaiser Crater (located at approx. 47° South Latitude and 340° West Longitude) is one such place. At a latitude comparable to Seattle, Washington, Duluth, Minnesota, or Helena, Montana, Kaiser Crater is studied primarily because of the sand Dunefield found within the confines of its Walls (lower center of the MOC image). The normally dark-gray or blue-black sand can be seen in this image to be shaded with light-toned frost. Other parts of the Crater are also frosted (...)".
MareKromium
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Deuteronilus_Mensae-PCF-LXTT-05.jpgFeatures of Deuteronilus Mensae (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 160 visitenessun commentoMareKromium
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Channels-Unnamed_Channel_near_Cydonia_Region-PIA07272-01.jpgArabia Terra, near Cydonia Region: the "Sphynx" River (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 160 visitenessun commentoMareKromium
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Craters-Unnamed_Craters-MGS-PCF-LXTT.jpgMartian Spectacles! (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)159 visiteCaption NASA originale:"This MGS-MOC image shows a pair of partially-buried impact craters which are being exhumed on a plain east of Hellas in the Promethei Terra Region Mars".
Location near: 45,5° South; 256,5° West
Image width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern AutumnMareKromium
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Channels-Bahram_Vallis-Landslide-M1000913-01.jpgLandslide in Bahram Vallis (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)159 visiteMareKromium
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