Springtime Dunes On Mars
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Springtime Dunes On Mars

August 29, 2012
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows part of a dune field in Chasma Boreale, the large north polar trough. The bright material covering the dunes is frozen carbon dioxide. This carbon dioxide frost accumulates during the northern autumn and winter, and sublimes away (turns directly from solid to gas) during the spring and summer. The image was acquired near the end of the northern spring. The dark areas in this image are places where the frost sublimed away, revealing the coarse dark sand of the dunes. MGS MOC Release No. MOC2-1565, 25 August 2006

Credits: NASA/JPL/Malin Space Science Systems

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