NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Martian sand dunes. Mars Global Surveyor (MGS) image of sand dunes on Mars. These dunes are in Proctor Crater in Mars' southern hemisphere. They were created by the wind, which blows mainly from the east and northeast (right and upper right in this image). The sand in between the dunes shows a finer rippling pattern, also due to the wind. Image taken by the Mars Orbiter Camera (MOC) on board the MGS spacecraft orbiting Mars.
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