| Piú votate - Mars Reconnaissance Orbiter (MRO) |
PSP_010882_2040_RED_abrowse-PCF-LXTT.jpgFeatures of Mawrth Vallis (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)105 visitenessun commentoMareKromium
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PSP_010877_1610_RED_abrowse-PCF-LXTT.jpgCentral Uplift (Absolute Natural Colors; additional process.: Dr Paolo C. Fienga - Lunexit Team)91 visitenessun commentoMareKromium
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PSP_010862_1880_RED_abrowse-00-PCF-LXTT.jpgRecent Impact in Amazonis Planitia (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)92 visitenessun commentoMareKromium
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ESP_020958_1680_RED_abrowse-PCF-LXTT.jpgMassif in Coprates Chasma (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)87 visitenessun commentoMareKromium
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ESP_020959_0985_RED_abrowse-PCF-LXTT.jpgEarly Spring at Inca City (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)68 visitenessun commentoMareKromium
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North_Polar_Layers-PSP_001332_2620_RED.jpgUnconformity in the North Polar Layered Deposits (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)65 visitenessun commentoMareKromium
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North_Polar_Layers-Tra_000825_2665_red.jpgNorth Polar Layered Deposits (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team:)65 visitenessun commentoMareKromium
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Northern_Dunes-PIA13797-2-PCF-LXTT.jpgSeasonal Changes in a Dune of the North Polar Erg (Absolute Natural Colors; credits for the Additional Process. and Color.: Dr Paolo C. Fienga - Lunexit Team)73 visitenessun commentoMareKromium
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Northern_Dunes-PIA13797-1.jpgSeasonal Changes in a Dune of the North Polar Erg54 visiteThree images of the same location taken at different times on Mars show seasonal activity causing Sand Avalanches and Ripple changes on a Martian Dune. Time sequence of the images progresses from top to bottom. Each image covers an area of 285 meters (312 yards) by 140 meters (153 yards). The Crest of a Dune curves across the upper and left portions of the image.
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter took these images. The site is at about 84° North Latitude and 233° East Longitude, in a vast Region of Dunes at the Edge of Mars' North Polar Ice Cap. The area is covered by Carbon-Dioxide (CO2) Ice in Winter but is Ice-free in Summer. The top and bottom images show part of one Dune about one Mars Year apart, at a time of the year when all the Seasonal Ice has disappeared: in late Spring of one year (top) and early Summer of the following year (bottom). The middle image is from the second year's mid-Spring, when the Region was still covered by Seasonal CO2 Ice.
Spring evaporation of the Seasonal Layer of Ice is manifested as Dark Streaks of fine particles carried to the top of the Ice Layer by escaping gas. The bottom of the Ice Layer, in contact with the Dark Ground, warms faster than the top of the Ice does in the Spring. Carbon-Dioxide gas produced by the thawing (----> disgelo) of the bottom Ice is temporarily trapped under the top Ice.
As the Ice evaporates from the bottom, flow of gas under the Ice destabilizes the Sand on the Dune, thus causing the Sand itself to avalanche down the Dune "Slipface".
A before-and-after comparison of the Dune shows new Alcoves and extension of the Debris Apron on the Slipface of the Dune caused by descending Grains of Sand. New Wind Ripples appear on the Debris Apron.
The top image is a portion of the HiRISE observation catalogued as PSP_008867_2640, taken on June 17, 2008.
The middle image is a portion of the HiRISE observation catalogued as ESP_016779_2640, taken on Feb. 23, 2010.
The bottom image is a portion of the HiRISE observation catalogued as ESP_018427_2640, taken on July 2, 2010.MareKromium
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PSP_004000_0945_RED_abrowse-00.jpgChangings... (CTX Frame - credits: NASA/JPL/University of Arizona)91 visiteHiRISE is monitoring the Residual Carbon Dioxide Cap on (or near) the South Pole of Mars to see how it changes over time.
Some of this Terrain contains many Pits, earning it the nickname "Swiss Cheese Terrain". One of our monitoring spots is over what looks like a deranged "Happy Face". If you look closely, you'll see many changes since the first HiRISE image, PSP_004000_0945, was acquired in 2007. The news is that the Pits have grown larger. When this Pit growth was first discovered, it was suggested to be an indication of climate change on Mars. However, we now suspect that the CO2 that sublimates from the Pit Walls recondenses on the nearby surfaces, so there is no net change in the total amount of frozen CO2.
Acquisition date: December, 30th, 2010
Mars Local Time (M.L.T.): 18:03 (Late Afternoon)
Latitude (centered): 85,7° South
Longitude (East): 6,5°
Spacecraft Altitude (or Range to Target Site): 247,6 km (154,8 miles)
Original image scale range: 24,8 cm/pixel (with 1 x 1 binning) so objects ~74 cm across are resolved
Map Projected Scale: 25 cm/pixel
Map Projection: POLAR STEREOGRAPHIC
Emission Angle: 0,2°
Phase Angle: 78,9°
Solar Incidence Angle: 79° (with the Sun about 11° above the Local Horizon)
Solar Longitude: 207,7° (Northern Autumn)MareKromium
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PSP_004000_0945_RED_abrowse-01.jpgChangings... (EDM - credits: NASA/JPL/University of Arizona)96 visitenessun commentoMareKromium
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PSP_003063_2050_red.jpgProposed MSL Landing Site in Mawrth Vallis (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 150 visitenessun commentoMareKromium
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