"The rippled surface of the first Martian sand dune ever studied up close fills this Nov. 27, 2015, view of ""High Dune"" from the Mast Camera on NASA's Curiosity rover. This site is part of the ""Bagnold Dunes"" field of active dark dunes along the northwestern flank of Mount Sharp. Credit: NASA/JPL-Caltech/MSSS"
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