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Dunes on Floor of Samara Valles, Mars

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by NASA/JPL-Caltech/University of Arizona

NASA Image Library · 公有领域（Public Domain）

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This image taken by NASA Mars Reconnaissance Orbiter shows Samara Valles, one of the longest ancient valley systems on Mars; its surface is mantled with dust as evidenced by the system of dunes that line the valley floor.

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