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June 5, 2013
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows material on the floor of a crater in Noachis Terra, west of Hellas Planitia. Windblown features, both the large, dark-toned sand dunes and smaller, light-toned ripples, obscure and perhaps, protect portions of the crater floor from further modification by erosional processes. MGS MOC Release No. MOC2-1481, 2 June 2006

Credits: NASA/JPL/Malin Space Science Systems