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Last updated on April 17, 2014 at 21:23 EDT
Polar Dunes
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Polar Dunes

October 12, 2009
The dunes in this image of the Vastitas Borealis region of Mars are just one of many dune fields/sand seas found at high latitudes. These sand seas migrate around the north polar cap following the strong polar vortex winds. Covered by frost in the winter, the dunes defrost and can actively move during the summer.