Cassini radar sees sand dunes in Belet (a dark equatorial albedo feature) on Saturn's giant moon Titan (lower photo) that are sculpted like Namibian sand dunes on Earth (upper photo). The bright features in the lower radar photo are not clouds but topographic features among the dunes.
NASA/JSC - uppper photo; NASA/JPL - lower photo
<a href="//commons.wikimedia.org/wiki/File:Titan_dunes.jpg" title="File:Titan dunes.jpg">File:Titan dunes.jpg</a>