Sand Dunes Formed In Martian Crater

The European Space Agency's (ESA's) Mars Express orbiter imaged a large field of sand dunes (about 7 x 12 km) in the floor of a large Martian crater (approximately 45 km wide and 2 km deep) in Argyre Planitia. Similar sand dunes are found on Earth, such as the Great Sand Dunes National Monument in Colorado, US (featured as an Image Of the Week on the Space Imaging website in 2003).

   More...