images

Sand Dunes on Mars

by

NASA/JPL/Univ. of Arizona/Novapix

Reference

a-mar11-00036

Date

2009-10-16

Sand dunes in the center of a large crater at mid-north latitude on Mars seen by HIRISE camera with a resolution of 50 cm (18 inches) per pixel.
Blue-gray swirls arcing across the dunes are tracks caused by dust devils, which are mini-tornadoes, vacuumed up the dust, revealing the darker sand underneath. Image taken on august 24 2009 by Mars Reconnaissance Orbiter (MRO) spacecraft.