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English: Dunes of sand-sized materials have been trapped on the floors of many Martian craters. This is one example, from a crater in Noachis Terra, west of the giant Hellas impact basin. The dunes here are linear, thought to be due to shifting wind directions. In places, each dune is remarkably similar to adjacent dunes, including a reddish (or dust coloured) band on north-east-facing slopes. Large angular boulders litter the floor between dunes.
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Ffynhonnell NASA Image of the Day
Awdur NASA/JPL-Caltech/University of Arizona

The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter captured this view.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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21 Ionawr 2010

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cyfredol15:31, 21 Ionawr 2010Bawdlun y fersiwn am 15:31, 21 Ionawr 20102,027 × 1,500 (565 KB)Originalwana{{Information |Description={{en|1=Dunes of sand-sized materials have been trapped on the floors of many Martian craters. This is one example, from a crater in Noachis Terra, west of the giant Hellas impact basin. The dunes here are l

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