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  1. #1
    Sagan's Avatar Carl Sagan
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    Dark Sand Cascades on Mars (APOD)



    Dark Sand Cascades on Mars
    Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA

    Explanation: They might look like trees on Mars, but they're not. Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost. The above image was taken in 2008 April near the North Pole of Mars. At that time, dark sand on the interior of Martian sand dunes became more and more visible as the spring Sun melted the lighter carbon dioxide ice. When occurring near the top of a dune, dark sand may cascade down the dune leaving dark surface streaks -- streaks that might appear at first to be trees standing in front of the lighter regions, but cast no shadows. Objects about 25 centimeters across are resolved on this image spanning about one kilometer. Close ups of some parts of this image show billowing plumes indicating that the sand slides were occurring even when the image was being taken.
    http://youtu.be/zSgiXGELjbc

    "A still more glorious dawn awaits
    Not a sunrise, but a galaxy rise
    A morning filled with 400 billion suns
    The rising of the milky way"

    "The sky calls to us
    If we do not destroy ourselves
    We will one day venture to the stars" -Carl Sagan

  2. #2
    Monotony's Avatar Undisputed Supreme Ruler of the Universe
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    That makes Mars look like tiger stripe Ice cream. Is their a Guinness world record for eating an entire planet of ice cream?

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