| Risultati della ricerca nelle immagini - "Murdo" |
ESP_014324_0955_RED_abrowse.jpgSnow-Streaks on McMurdo Crater (Natural Colors; credits: Lunexit)76 visiteThe SPLD are a stack of ice and dust about 3 Km (a little less than 2 miles) thick. The many layers that make up this feature are of great interest to planetary scientists because, just as with ice sheets on Earth, they are thought to contain a record of the Planets climate in previous times.
As with the rest of Mars, impact craters form continuously on these Polar Deposits.
Rarely, a very large impact will occur and the crater will excavate all the way through this ice-sheet to the rocky terrain underneath. This is what happened in the case of McMurdo, a crater roughly 20 Km (about 12,5 miles) across which punched through the ice-sheet in the past.
This HiRISE image shows the wall of this Crater, only half of which has been preserved until current times.
You can see the many layers that comprise the SPLD exposed here.
Scientists study exposures like this to try to understand the length of the climatic record that is recorded in the icy material at the Poles of Mars.MareKromium
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SOL932-McMurdo_L456atc-A814R1_br2-00.jpgMc Murdo Panorama (1)73 visiteCaption NASA originale:"This 360 view, called the "McMurdo Panorama", comes from the PanCam on NASA's MER Spirit. From April through October 2006, Spirit has stayed on a small hill known as "Low Ridge". There, the Rover's solar panels are tilted toward the Sun to maintain enough solar power for Spirit to keep making scientific observations throughout the Winter on Southern Mars.
This view of the surroundings from Spirit's "Winter Haven" is presented in approximately true color.
Oct. 26, 2006, marks Spirit's 1000th Sol of what was planned to be as a 90-Sol mission. (A "Sol" is a Martian day, which lasts 24 h., 39' and 35"). The Rover has lived through the most challenging part of its second Martian winter. Its solar power levels are rising again.
Spring in the Southern Hemisphere of Mars will begin in early 2007".
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SOL932-McMurdo_L456atc-A814R1_br2-01.jpgMc Murdo Panorama (2)71 visiteCaption NASA originale:"Before that, the Rover Team hopes to start driving Spirit again toward scientifically interesting places in the "Inner Basin" and "Columbia Hills" inside Gusev Crater. The McMurdo Panorama is providing team members with key pieces of scientific and topographic information for choosing where to continue Spirit's exploration adventure.
The PanCam began shooting component images of this panorama during Spirit's Sol 814 (April 18, 2006) and completed the part shown here on Sol 932 (Aug. 17, 2006). The panorama was acquired using all 13 of the Pancam's color filters, using lossless compression for the red and blue stereo filters, and only modest levels of compression on the remaining filters".
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SOL932-McMurdo_L456atc-A814R1_br2-02.jpgMc Murdo Panorama (3)67 visiteCaption NASA originale:"The overall panorama consists of 1449 PanCam images and represents a raw data volume of nearly 500 megabytes. It is thus the largest, highest-fidelity view of Mars acquired from either Rover. Additional photo coverage of the parts of the Rover deck not shown here was completed on Sol 980 (Oct. 5 , 2006). The team is completing the processing and mosaicking of those final pieces of the panorama, and that image will be released on the Web shortly to augment this McMurdo Panorama view".
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