NASA's Mars Global Surveyor shows barchan and linear dunes that seem to have grown from the coalescence of barchans in a crater in the Noachis Terra region on Mars.

18 June 2004
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows barchan and linear dunes that seem to have grown from the coalescence of barchans in a crater in the Noachis Terra region. The winds responsible for these dunes blow from the lower left (southwest). The image occurs near 46.0°S, 323.6°W, and covers an area about 3 km (1.9 mi) wide. Sunlight illuminates the scene from the upper left.

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