10 of 11Image
The Mars Reconnaissance Orbiter will study the surface of Mars for water, including this meteor impact crater in the Newton Basin where frost can be seen on the walls and sand dunes on the floor.
The Chasma Boreale is a trough in the north polar cap area of Mars. The spring photo shows dark sand emerging from bright frost from the winter.
Mars exploration has come a long way in a short time. This is the first photograph sent back from the surface of Mars by the Viking 1 lander on July 20, 1976.