<p>The Velvety Blue Dunes of Melas Chasma — This color-infrared image shows sand dunes in Melas Chasma, located within the Valles Marineris.  
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NASA/JPL/University of Arizona
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2018-09-14 16:40
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/43393909610/">ESP_055322_1680</a>