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NASA: Chasma Boreale, Mars

Discussion in 'Tech, Science, and Space' started by Robby, Mar 15, 2011.

  1. Robby

    Robby The Robot

    Joined:
    Jul 28, 2004
    Location:
    Terra
    (click to view the full-size image)
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    Chasma Boreale, a long, flat-floored valley, cuts deep into Mars' north polar icecap. Its walls rise about 4,600 feet, or 1,400 meters, above the floor. Where the edge of the ice cap has retreated, sheets of sand are emerging that accumulated during earlier ice-free climatic cycles. Winds blowing off the ice have pushed loose sand into dunes and driven them down-canyon in a westward direction. This scene combines images taken during the period from December 2002 to February 2005 by the Thermal Emission Imaging System instrument on NASA's Mars Odyssey was part of a special series of images marking the orbiter as the longest-working Mars spacecraft in history. Image Credit: NASA/JPL-Caltech/ASU (More at NASA Picture Of The Day)
     

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