Mars’ moving dunes

A piece of Mars: Today’s image comes courtesy of my postdoc, Simone Silvestro. He’s studying migrating dunes and has made a 3 image movie of a dune moving across the surface of Mars. This one crawls at a rate of ~0.5 m/year, and it isn’t far from where the Curiosity rover will pass when it

Echoes of the past

These dunes are quite unusual for Mars, and difficult to interpret. The thick blue and white stripes are dunes in their current location, but subtle stripes above them seem to indicate former positions of dunes, small pieces that got left behind as the dunes marched toward the bottom of the image. (HiRISE ESP_022645_1505)