NASA / JPL / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY
Martian sand dunes. Coloured satellite image of north polar sand dunes blown into crescent shapes by the wind. The surface is covered by carbon dioxide frost (light brown) except the darker areas where the carbon dioxide has sublimated (turned from solid directly to gas) and exposed the basaltic sand beneath. Image obtained by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) on 23rd July 2008. The width of this image is roughly 1.3 kilometres across.
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