| Piú viste - A Tribute To Mars Global Surveyor |
North_Polar_Features-Unconformities-00.jpgNorth Polar "Unconformity" (Original NASA/MGS/MSSS b/w Frame)72 visiteCaption NASA originale:"This MGS-MOC image shows an Unconformity in an exposure of North Polar Layered Material, at which older Layers were cut-off and eroded before a new suite of Layers was deposited above them.
The Terrain in the entire scene was covered by a thin layer of CO2 Frost at the time this picture was acquired in June 2006".
Location near: 86,1 North Lat. and 208,5 West Long.
Image width: ~4 Km (~2,5 mi)
Illumination from: lower left
Season: Northern Spring
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North_Polar_Features-Dunes-MGS-06.jpgNorth Polar Dunes (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)72 visiteCaption NASA originale:"This MGS-MOC image shows dunes in the North Polar Region of Mars. In this scene, the dunes and the plain on which the dunes reside, are at least in part covered by a bright CO2 frost.
Dark spots indicate areas where the frost has begun to change, either by subliming away to expose dark sand, changing to a coarser particle size, or both.
The winds responsible for the formation of these dunes blew from the South-West toward the North-East.
Location near: 76,3° North; 261,2° West
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern SpringMareKromium
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Craters-Rabe_Crater-I-M0203079-01.jpgThe "Pitted" West Floor of Rabe Crater (2) - (Original NASA/MGS/MSSS b/w Frame)71 visitenessun commento
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Craters-Eberswalde_Crater-4-PIA04293_fig3.jpgEberswalde Crater and Delta (Sub-meter-per-pixel cPROTO - detail mgnf)71 visiteOriginal caption:"Even with the roll only targeted observation technique, it took more than one Earth year to build up a complete mosaic of images of the delta. In the meantime, the first data showing the deltaic landforms were archived and released to the public and scientific community, long before the MOC Team's analysis and mosaic were complete. Some scientists began independent analyses of the landform at that time. The initial analysis and announcement of the feature was finally published in November 2003.
The Eberswalde delta provides the first clear, 'smoking gun' evidence that some valleys on Mars experienced persistent flow of a liquid with the physical properties of water over an extended period of time, as do rivers on Earth. In addition, because the delta today is "lithified" - that is, hardened to form rock - it provided the first unambiguous evidence that some martian sedimentary rocks were deposited in a liquid (presumably, water) environment. The presence of meandering channels, a cut-off meander, and crisscrossing channels at different elevations (one above the other), provided the clear geologic evidence for these interpretations".
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Isidis_Planitia.jpgMartian "Cat-paw" print - Isidis Planitia (Original NASA-MGS-MSSS b/w Frame) 71 visiteOriginal caption:"This MGS-MOC image shows a mesa in North-Eastern Isidis Planitia. The mesa might be a remnant of terrain that once more extensively covered the Region".
Location near: 20,3 North and 267,7 West
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Winter
Nota: il titolo che abbiamo dato al frame giustificato dalla formazione craterica visibile sulla mesa la quale ci ricorda, in maniera quasi perfetta, l'impronta di un felino sulla sabbia.
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Channels-Inverted_Channels_in_Arabia_Terra-PIA03643-02.jpgInverted channels of Arabia Terra (2 - Original NASA/MGS/MSSS b/w Frame)71 visiteOriginal caption:"This MGS-MOC image shows a somewhat sinuous, nearly flat-topped Ridge, located in Eastern Arabia Terra. The ridgetop was once the Floor of a Valley, perhaps carved by running water. The Valley Floor, or material that covered the Floor, was more resistant to erosion than the surrounding rock into which the Valley was cut. Thus, over time, the Valley disappeared and its Floor was left standing high as a Ridge. Inverted Valleys are common on Mars, but they also occur on Earth".
Location near: 10,8 North Lat. and 313,2 West Long.
Image width: width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Winter
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Craters-Becquerel_Crater-Layers-00.jpgBeautiful Layers inside Becquerel Crater (Original NASA/MGS/MSSS b/w Frame)71 visiteOriginal caption:"This MGS-MOC image shows light-toned, layered, Sedimentary Rock Outcrops in Becquerel Crater , located in the Western Arabia Terra Region. The Crater may once have hosted a lake, into which these sediments were deposited. Although the fine, detailed layering in Becquerel was not known until the MGS-MOC first began to image these materials in 1999, the presence of a grossly-layered, light-toned feature was known from Viking orbiter images and was speculated from those data to possibly represent evidence for the presence of a former lake".
Location near: 21,5 North Lat. and 8,2 West Long.
Image width: ~3 Km (~1,9 mi)
Season: Northern Winter
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Craters-Terby_Crater-02.jpgThe Sedimentary Layers of Terby Crater (2 - Original NASA/MGS/MSSS b/w Frame)71 visitenessun commento
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Aeolian_Features-Windstreaks-Chrise_Planitia-MGS-00.jpgSigns of the wind in Chryse Planitia (Original NASA/MGS/MSSS b/w Frame)71 visiteCaption NASA originale:"This MGS-MOC image shows two Unnamed Impact Craters of nearly equal size, plus their associated Windstreaks. These occur in far Eastern Chryse Planitia. The Wind streaks point toward the South-West, indicating that the responsible Winds blew from the North-East. One of the two craters is shallower than the other and has a suite of large, windblown Ripples on its Floor. The shallower Unnamed Crater with the Ripples is probably older than the other, deeper Unnamed Crater".
Location near: 20,6 North Lat. and 30,1 West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Winter
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Craters-Unnamed_Crater_in_Terra_Tyrrhena-MGS-03.jpgUnnamed Crater and Dunes in Terra Tyrrhena (Original NASA/MGS/MSSS b/w Frame)71 visitenessun commento
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South_Polar_Features-Swiss_Cheese_Terrain-04.jpgThe "drawings" of the South Polar Residual Cap (2)71 visitenessun commento
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Volcanoes-The_FootPrint_Volcano-A-MGS.jpgThe "Footprint Volcano" (Original NASA/MGS/MSSS b/w Frame)71 visiteCaption NASA originale:"This MGS-MOC image shows a small, dust-mantled volcano on the plains East of the giant martian volcano, Pavonis Mons".
Location near: 1,6° South Lat.; 105,7° West Long.
Image width: ~3 Km (~1.9 mi)
Illumination from: lower left
Season: Southern Spring
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