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US-SPACE-MARS-WATER
This NASA handout image received on November 20, 2008 shows a computer graphic with three craters in the eastern Hellas region of Mars containing concealed glaciers detected by radar. The image shows how the surface looks today with the ice covered with a layer of Martian soil. The image was created using image data from the Context Camera on the Mars Reconnaissance Orbiter (MRO) spacecraft combined with results from the SHARAD radar sounder on MRO and HRSC digital elevation map from the Mars Express spacecraft. The color of the Martian surface and ice was estimated from MRO HiRISE color images of other Martian craters and the polar ice caps. The buried ice in these craters as measured by SHARAD is ~ 250 meter thick on the upper crater and ~ 300 and 450 meters on the middle and lower levels respectively. Each image is 20 km (12.8 mi.) across and extends to 50 km (32 mi) in the distance. "All together, these glaciers almost certainly represent the largest reservoir of water ice on Mars that's not in the polar caps," said John Holt, a geophysicist at the University of Texas at Austin and lead author of a report about the discovery, which appears in the November 21 issue of the journal Science. AFP PHOTO/NASA/JPL-CALTECH/HANDOUT/RESTRICTED TO EDITORIAL USE =GETTY OUT=
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Detalii fotografie |
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-, SPACE |
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AFP / Mediafax Foto |
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HO |
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20 Noiembrie 2008 |
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3000 x 1935 (1.42 MB) |
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