| Piú viste - A Tribute To Mars Global Surveyor |
Troughs-Olympica_Fossae-MGS-03.JPGTroughs System in Olympica Fossae (Original NASA/MGS/MSSS b/w Frame)64 visiteCaption NASA originale:"This MGS-MOC image shows a wide, flat-floored Trough flanked by several smaller, branching Troughs in the Olympica Fossae Region of Mars. Dark and intermediate-toned Slope Streaks both created by dry Avalanches of Dust occur on the Trough Walls".
Location near: 25,1 North; 113,8 West
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Winter
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Troughs-Labeatis_Fossae-MGS.jpgDeep Trough in Labeatis Fossae (Original NASA-MGS-MSSS b/w Frame) 64 visiteCaption NASA originale:"This MGS-MOC image shows a portion of a trough cutting across a dust-covered plain in the Labeatis Fossae Region of Mars. Boulders derived from the layered exposures near the top of the trough walls are resting on the floor, and in some locations, the sloping sidewalls of the dusty trough".
Location near: 22,1 North; 94,5 West
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Spring
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North_Polar_Features-Dunes-MGS-10.jpgDefrosting North Polar Dunes (Original NASA/MGS/MSSS b/w Frame)64 visiteCaption NASA originale:"This MGS-MOC image shows a portion of a sand dune field in the North Polar Region of Mars. The dunes are covered with frozen CO2, which accumulated over the Autumn and Winter months in the Northern Hemisphere.
During the Spring, the time at which this image was acquired, the CO2 begins to sublime away, going directly from solid to gas, just as dry ice does here on Earth.
The dark spots, streaked by blowing winds, may be places where the frost has been removed (exposing underlying dark sand), places where the grain size or roughness of the frost has increased (increasing shadowing due to the change in texture), or both".
Location near: 79,7° North Lat. and 148,3° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Spring
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North_Polar_Features-North_Polar_Scarp-MGS-00.jpgNorth Polar Panorama (Original NASA/MGS/MSSS b/w Frame)64 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
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Volcanic_Features-Pits-A.jpgUnusually-looking Collapse Pits (Original NASA/MGS/MSSS b/w CTX Frame)64 visiteLocation near: 22,1 North Lat. and 53,2 East Long.
Image width: ~3 Km (~1,9 mi)
Season: Northern Spring
Resolution: 18 mt/pixel
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North_Polar_Features-Unconformity-02.jpgNorth Polar "Minor Unconformity" (Original NASA/MGS/MSSS b/w Frame)64 visiteCaption NASA originale:"This MGS-MOC image shows Layers exposed in a Trough in the Martian North Polar Region. At the time the picture was acquired, the entire scene was covered by seasonal Carbon Dioxide Frost. By late Spring and into Summer, these Layers would appear darker, once the CO2 Frost sublimes away".
Location near: 84,9 North Lat. and 263,3 West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Spring
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North_Polar_Features-Unconformities-01.jpgNorth Polar "Unconformities" (Original NASA/MGS/MSSS b/w Frame)64 visiteCaption NASA originale:"This MGS-MOC image shows Layers exposed in the North Polar Region of Mars. The North Polar Cap is underlain by a thick sequence of Layered Material. The Layers are most commonly exposed on the slopes of troughs that are believed to have formed by Wind Erosion. The Layers give a banded appearance. In this example, some of the Layers are cut off (truncated) by other Layers. This truncation is a classic, textbook example of an Erosional Unconformity, a term commonly used by geologists. The Unconformity occurs when deposition of new layered material stops for a while and erosion occurs. Then, new layers form on top of the eroded surface and the older layers, at some point in time when the erosion stops and deposition of layered material resumes".
Location near: 78,6 North Lat. and 342,0 West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: upper right
Season: Northern Spring
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Phobos_from_Mgs-010.jpgPhobos, from MGS (Original NASA/MGS/MSSS Full Frame n. 4)64 visitenessun commentoMareKromium
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Troughs-Tharsis_Region-PIA04103-001.jpgWhat's inside the Trough? (EDM n.1- Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)64 visiteSiamo proprio certi che nei canaloni della Regione Marziana di Cerberus Fossae non vi sia nulla di interessante (a parte accumuli di polveri e dunette)?!?
Osservate bene...
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Troughs-Tharsis_Region-PIA04103-002.jpgWhat's inside the Trough? (EDM n.2 - Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)64 visitenessun commento
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Inca-City-M0306902-01.jpgA true "South Polar Oddity": Inca City (3 - False Colors)64 visiteThe Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) has provided new information about the "Inca City" ridges, though the camera's images still do not solve the mystery. The new information comes in the form of a MOC red wide angle context frame taken in Mid-Southern Spring (Image 1). The MOC image shows that the "Inca City" ridges, located at 82 South and about 67 West (293 East), are part of a larger circular structure that is about 86 Km (about 53 mi) across. It is possible that this pattern reflects an origin related to an ancient, eroded meteor impact crater that was filled-in, buried, then partially exhumed. In this case, the ridges might be the remains of filled-in fractures in the bedrock into which the crater formed, or filled-in cracks within the material that filled the crater. Or both explanations could be wrong. While the new MOC image shows that "Inca City" has a larger context as part of a circular form, it does not reveal the exact origin of these Striking and Unusual Martian Landforms.
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Inca-City-AB107908.jpgA true "South Polar Oddity": Inca City (1)64 visiteDati contestuali di riferimento:
Longitude of image center: 64,63 West
Latitude of image center: 81,48 South
Scaled pixel width: 15,47 mt
Scaled image width: 31,88 Km
Scaled image height: 32,87 Km
Solar longitude (Ls): 246,89
Local True Solar Time (M.L.T.): 12,90 (decimal hours) such as --> 12:54
Emission angle: 58,14
Incidence angle: 58,59
Phase angle: 25,53
North azimuth: 250,10
Sun azimuth: 238,48
Spacecraft altitude: 3222,87 Km
Slant distance: 4167,30 Km
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