NASA / JPL / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY
Martian north polar terrain. Coloured satellite image of ice-covered sand dunes in the north polar region of Mars. Wind action has created crescent-shaped dunes (right half of image). The dark circular patches on the left are areas where frozen carbon dioxide has sublimated (turned from solid direct to gas) to reveal the darker basaltic sand underneath. Image obtained by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) on 9th February 2008. The width of this image is roughly 1.3 kilometres across.
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