NASA's Mars Global Surveyor shows a field of sand dunes in a crater in Noachis Terra on Mars. Patches of autumn frost, possibly water ice, are evident.

22 October 2004
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a field of sand dunes in a crater in Noachis Terra near 49.6°S, 352.9°W. Patches of autumn frost, possibly water ice, are seen on the south/southeastern (bottom/lower right) slopes of the dunes. This image mosaics with the east side of the dune image released as MOC Picture of the Day on 22 September 2004. The image covers an area about 3 km (1.9 mi) wide. Sunlight illuminates the scene from the upper left.

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