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North Polar Sand Dunes

NASA's Mars Global Surveyor shows dunes composed of low albedo (dark) sand grains encircle the north polar cap of Mars. This view was taken during the northern summer in May 1999.
PIA02068
Credits: NASA/JPL/MSSS
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Description

Dunes composed of low albedo (dark) sand grains encircle the north polar cap of Mars. This view was taken during the northern summer in May 1999.