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Home A dune in the northern polar region of Mars shows significant changes between two images taken on June 25th, 2008 and May 21st, 2010 by NASA’s Mars Reconnaissance Orbiter. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL) A dune in the northern polar region of Mars shows significant changes between two images taken on June 25th, 2008 and May 21st, 2010 by NASA's Mars Reconnaissance Orbiter. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)

A dune in the northern polar region of Mars shows significant changes between two images taken on June 25th, 2008 and May 21st, 2010 by NASA’s Mars Reconnaissance Orbiter. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)

A dune in the northern polar region of Mars shows significant changes between two images taken on June 25th, 2008 and May 21st, 2010 by NASA's Mars Reconnaissance Orbiter. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)

A dune in the northern polar region of Mars shows significant changes between two images taken on June 25th, 2008 and May 21st, 2010 by NASA’s Mars Reconnaissance Orbiter. (Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL)

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