<p>Once in a Blue Dune — Sand dunes often accumulate in the floors of craters. In this region of Lyot Crater there is a field of classic barchan dunes.
</p><p>Just to the south of the group of barchan dunes is one large dune with a more complex structure. This particular dune, appearing like turquoise blue in enhanced color, is made of finer material and/or has a different composition than the surroundings.
</p><p>NASA/JPL/University of Arizona
(347 km above the surface)
</p>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2018-05-18 15:21
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