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Home A rippled dune front in Herschel Crater on Mars moved an average of about one meter (about one yard) between March 3rd, 2007 and December 1st, 2010. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL) A rippled dune front in Herschel Crater on Mars moved an average of about one meter (about one yard) between March 3rd, 2007 and December 1st, 2010. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)

A rippled dune front in Herschel Crater on Mars moved an average of about one meter (about one yard) between March 3rd, 2007 and December 1st, 2010. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)

A rippled dune front in Herschel Crater on Mars moved an average of about one meter (about one yard) between March 3rd, 2007 and December 1st, 2010. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)

A rippled dune front in Herschel Crater on Mars moved an average of about one meter (about one yard) between March 3rd, 2007 and December 1st, 2010. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)

A rippled patch of sand in Becquerel Crater on Mars moved about two meters (about two yards) between November 24, 2006 and September 5th, 2010. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)
The eastern margin of a rippled dune in Herschel Crater on Mars moved an average distance of three meters (about three yards) between March 3rd, 2007 and December 1st, 2010. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)