NASA's Mars Global Surveyor shows some of the rounded, wind-eroded sand dune features in a crater in the southern hemisphere of Mars. For such rounding to occur, the dune sand might need to be somewhat cemented.

28 June 2004
Looking somewhat like caterpillars, this April 2004 Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows some of the rounded, wind-eroded sand dune features in a crater in the southern hemisphere near 61.7°S, 160.3°W. For such rounding to occur, the dune sand might need to be somewhat cemented. The picture covers an area about 3 km (1.9 mi) wide and is illuminated by sunlight from the upper left.

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