The Mars Reconnaissance Orbiter (MRO) is a NASA spacecraft launched in 2005 that has been orbiting Mars since 2006. It conducts high-resolution imaging and analysis of the planet’s surface, subsurface, and atmosphere, searching for signs of past water and identifying potential landing sites for future missions.
Source: science.nasa.gov
04/04/2008

At first glance these undulating shapes in shades of blue might look like waves on an ocean. Seen here in a false-color image from the Mars Reconnaissance Orbiter's HiRISE camera, they are actually layered rock outcrops found in Aureum Chaos. The larger Aureum Chaos region is a chaotic jumble of eroded terrain in the eastern part of Mars' immense canyon Valles Marineris. Distinct layers composing these outcrops could have been laid down by dust or volcanic ash settling from the atmosphere, sand carried by martian winds, or sediments deposited on the floor of an ancient lake. This close-up view of the otherwise red planet spans about 4 kilometers, a distance you might walk over flat ground in less than an hour.