The resolution and ability of the HiRISE camera to take multiple images of the same target has allowed scientists to monitor and detect small-scale changes on the surface of Mars over time.
Some of the linear ripples on these large crescent-shaped dunes in the Nili Patera region are moving, confirming they are active in the current climate conditions.
Written by: Sharon Wilson (8 June 2011)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_022364_1890
Image: NASA/JPL/University of Arizona