| Ultimi arrivi - Mars Reconnaissance Orbiter (MRO) |
ESP_021705_1510_RED_abrowse-01-PCF-LXTT-1.jpgHydrated Minerals (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)435 visitenessun commentoMareKromiumApr 18, 2011
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ESP_021892_1775_RED_abrowse-PCF-LXTT-1.jpgFeatures of the N/W Rim of Endeavour Crater (CTX Frame + mini EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)470 visitenessun commentoMareKromiumApr 18, 2011
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ESP_021892_1775_RED_abrowse-PCF-LXTT-2.jpgFeatures of the N/W Rim of Endeavour Crater (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)513 visitenessun commentoMareKromiumApr 18, 2011
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PSP_006724_2165_RED_abrowse-PCF-LXTT.jpgUnnamed Channel in Utopia Planitia (Absolute Natural Colors; credits for the additional process. and coloring: Dr Paolo C. Fienga - Lunexit Team)238 visiteSeen here are gullies in an Unnamed Northern Crater. The Crater is well-preserved as indicated by its sharp Rim and steep Walls.
Gullies are rarer in the Northern Hemisphere, possibly because there are fewer Slopes for them to form on compared to the heavily cratered Southern Highlands.
This image captures a wide range of Gully morphologies. The Gullies on the North Wall (such as the South-facing Wall) are more abundant and evenly-spaced than those on the East and South Walls and they extend up to the Crater Rim on the northern side. These differences might occur because of differences in sunlight exposure and temperature variations.
The Crater Floor has a linear texture suggestive of flow. Ice-rich material might have moved off the Crater Walls, driven by gravity, and flowed towards the Crater center.MareKromiumApr 17, 2011
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PSP_007959_1980_RED_abrowse-PCF-LXTT.jpgThe Beautiful Colors of Olympus Mons' Summit (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)259 visiteOlympus Mons, the largest Volcano in the Solar System, has a large depression at its top. This depression, called “Caldera” by geologists, is caused by the collapse of the top of the Volcano as magma is drained out from an underground Holding Chamber.
Previous studies have demonstrated multiple collapses, indicating that there were Holding Chambers in slightly different locations within the Volcano that emptied at various times.
This HiRISE image examines the walls of one such collapse which exposes the Layers of rock within the uppermost part of Olympus Mons.
In the sections not covered by Dust, hundreds of thin discontinuous Layers are visible. The thicknesses and widths of these Layers are similar to those of the Lava Flows seen on the Surface of Olympus Mons. This confirms the assumption that the Volcano is built up of many thousands of similar Lava Flows.
There is also at least one Layer cutting diagonally across the stack of Lava Flows. This is an intrusion of magma, most likely a feeder to some of the uppermost Lava Flows. However, this HiRISE image indicates that such intrusions make up only a minor part of the upper section of the Volcano.MareKromiumApr 14, 2011
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PSP_006959_2610_RED_abrowse-PCF-LXTT.jpgFrozen Dunes (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)168 visitenessun commentoMareKromiumApr 14, 2011
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PSP_007946_2035_RED_abrowse-PCF-LXTT.jpgOlympus' Lava (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)169 visitenessun commentoMareKromiumApr 14, 2011
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PSP_001596_1525_RED_browse-01-PCF-LXTT.jpgLayering inside Terby Crater (Absolute Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)251 visiteImage PSP_001596_1525 shows a sequence of predominantly light-toned, layered, sedimentary rocks exposed by erosion on the floor of Terby Crater. Terby Crater is ~165 Km (~100 miles) in diameter. It's located on the northern rim of the Hellas impact basin in the Southern Hemisphere of Mars.
The layered sequence is ~2 Km (~1,2 miles) thick and consists of many repetitive, relatively horizontal beds. The beds appear to be laterally continuous, which means you can identify a given layer in many locations across the area.
Details in the layering seen in this HiRISE image reveal variations in the brightness of the layers and may indicate differing mineralogies. Based on the ease with which wind appears to erode these layers, they are believed to be composed mostly of fine-grained sediments.
However, one or more of the beds is weathering to form meter(yard)-scale boulders that have accumulated downslope in fans of debris.
These larger boulders indicate the material in the layers may be stronger than just fine-grained sediments.
It's not clear how these layers formed, but it may have involved deposition by wind or volcanic activity. Another theory involves all or part of the Hellas basin being filled with ice-covered lakes at one time in the past. The layers we see may have formed as material that was suspended in the water dropped down to the bottom of the lake. MareKromiumApr 04, 2011
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PSP_003162_1445_RED_browse-00-PCF-LXTT.jpgUnnamed Southern Crater with deep Gullies and Fill (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)143 visitenessun commentoMareKromiumApr 04, 2011
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PSP_005581_1815_RED_abrowse-PCF-LXTT.jpgPossible MSL Landing Site in Northern Meridiani Planum (Enhanced Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)234 visitenessun commentoMareKromiumApr 01, 2011
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PSP_004311_1050_RED_abrowse-PCF-LXTT.jpgBasal Exposure of South Polar Layered Deposits - SPLD (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)133 visitenessun commentoMareKromiumMar 31, 2011
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PSP_006250_2200_RED_abrowse-PCF-LXTT-0.jpgFeatures of Nilosyrtis Region (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)147 visitenessun commentoMareKromiumMar 29, 2011
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