Sands of Mars
This image provided by NASA Thursday Sept. 18, 2008 captures unusual arrow-shaped sand dunes in the north polar Olympia Undae region of Mars that may have been formed by changing winds. The dark patches and streaks show sand that has begun escaping from a blanket of seasonal frost. the interaction between the sand, wind, and seasonal frost sculpts the dunes to their unusual, arrow-like appearance. Newly posted images from more than 1,000 observations by the high resolution camera on NASA's Mars Reconnaissance Orbiter reveal details as small as a desk.
(AP Photo/NASA- JPL/University of Arizona)
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