HiRISE: Dune and ripple migration in Nili Patera

Nili Patera is a region on Mars in which dunes and ripples are moving rapidly. HiRISE continues to monitor this area every couple of months to see changes over seasonal and annual time scales. Here we see obvious activity over a span of less than two Earth years. Three prominent changes are obvious: 1) the dunes are migrating… [More at link]