Mars Reconnaissance Orbiter (MRO)
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PSP_002244_1720_red.jpgWhite Rock (Enhanced Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)53 visiteThis image shows a portion of a relatively bright landform named "White Rock" on the floor of Pollack Crater in the Sinus Sabaeus Region of Mars.
Data from the Mars Global Surveyor Thermal Emission Spectrometer (TES) indicates that this landform is not anomalously bright, relative to other bright Martian Regions. Further, the apparent brightness seen here is due to contrast with other materials on the crater floor.
Dunes and ripples are visible in the dark material between the bright ridges. Their orientations appear to be influenced by wind directionally channeled by the ridges. Material appears to have been shed from the white landform and deposited on the darker bedforms indicating that the light-toned outcrops break down into fine materials.
Its high albedo and location in a topographic basin have led to suggestions that White Rock is an erosional remnant of an ancient lacustrine evaporate deposit.
Other interpretations include an eroded accumulation of compacted or weakly cemented aeolian sediment.
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PSP_002290_1585andPSP_001868_1585-MemnoniaFossae-Channel-CollapseFeatures.jpgChannel and Graben in Memnonia Fossae (Hi-Def-3D - Extremely Enhanced Natural Colors; credits: Dr M. Faccin & Lunar Explorer Italia)53 visiteLatitude (centered): 21,5° South
Longitude (East): 211,2 °
Range to target site: 261,1 Km (approx. 163,2 miles)
Original image scale range: 26,1 cm/pixel (with 1 x 1 binning) so objects ~78 cm across are resolved
Map projected scale: 25 cm/pixel and North is up
Map projection: EQUIRECTANGULAR
M.L.T.: 15:37 (middle afternoon)
Emission angle: 9,3°
Phase angle: 70,6°
Solar Incidence Angle: 63°, with the Sun about 27 ° above the Local Horizon
Solar Longitude: 153,1° (Northern Summer)MareKromium
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PSP_002291_1335_red-PCF-LXTT.jpgGullies in Terra Sirenum (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit) 160 visitenessun commentoMareKromium
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PSP_002291_1335_red-PCF-LXTT~0.jpgGullies in Terra Sirenum (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)249 visitenessun commentoMareKromium
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PSP_002324_1815_red-PCF-LXTT.jpgNorthern Meridiani Planum (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)90 visitenessun commentoMareKromium
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PSP_002345_1095_red-PCF-LXTT.jpgSouthern Dunes (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)314 visitenessun commentoMareKromium
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PSP_002390_1320_RED_abrowse-00.jpgGullies in a Trough-Crater's Edge (CTX Frame - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)71 visitenessun commentoMareKromium
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PSP_002390_1320_RED_abrowse-01.jpgGullies in a Trough-Crater's Edge (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)75 visitenessun commentoMareKromium
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PSP_002419_1675_RED_abrowse-00.jpgLayers and Dark Debris in Melas Chasma (CTX Frame - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)104 visitenessun commentoMareKromium
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PSP_002419_1675_RED_abrowse-01.jpgLayers and Dark Debris in Melas Chasma (EDM - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)98 visiteThis EDM shows layering in a light-toned deposit in Melas Chasma.
The layers are sedimentary in origin, but there are many processes that could have deposited them, such as volcanic airfall from explosive eruptions, or dust-size particles settling out of the Atmosphere due to cyclic changes, and deposition in standing bodies of water.
By looking at the slopes in the layers and how the layers intersect each other, scientists can rule out various origins. A darker material can be seen covering much of the Layered Deposit.
Some of this dark material is loose and can be seen accumulating as debris aprons at the base of steep slopes. Other dark material appears indurated and has been eroded by the wind to form etched edges with topographic expressions.
The lack of impact craters on the Layered Deposit indicates that it is a relatively young deposit, or the craters have been removed by the wind, or the deposit was quickly buried and is now being exhumed.MareKromium
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PSP_002439_2265_RED_abrowse.jpgScalloped Depressions with Layering (False Colors; credits: Dr Paolo C. Fienga - Lunexit Team)54 visiteThis image of the Northern Plains of Mars is marked by depressions in a layer of material that covers the Region. The depressions, several of which have coalesced together, have scalloped edges and layers in their walls.
Features such as these are most commonly found at approx. 55° North and South latitude.
Their presence has led to hypotheses of the removal of subsurface material, possibly ground ice, by sublimation, and this process is believed to be ongoing today.
In this image, steeper scarps with layers consistently face the North Pole while more gentle slopes without layers face in the direction of the Equator. This is most likely due to differences in Solar Heating.
Large boulders, some several meters in length, are scattered within the depressions and on the surrounding Surface. Also on the Surface surrounding the scalloped depressions is a polygonal pattern of fractures.
This is commonly associated with Scalloped Terrain and indicates that the surface has undergone stress potentially caused by Subsidence (Collapse), Desiccation (Drying-out), or Thermal Contraction.
MareKromium
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PSP_002472_1810_red_abrowse-PCF-LXTT.jpgSlope Layers in Echus Chasma (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team:)55 visitenessun commentoMareKromium
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