NASA's Mars Global Surveyor shows a dark sand dune on the floor of a crater on Mars. Recent dust devils have disrupted a thin coating of dust on the otherwise dark dune.

MGS MOC Release No. MOC2-474, 5 September 2003

This August 2003 Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) picture shows a dark sand dune on the floor of a crater at 54.9°S, 342.5°W. Recent dust devils have disrupted a thin coating of dust on the otherwise dark dune; these wind phenomena created the plethora of markings and streaks on the dune. The image covers an area 3 km (1.9 mi) across and is illuminated by sunlight from the upper left.

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