Light blue clouds fill Coprates Chasma on Mars, part of Valles Marineris, the vast 'Grand Canyon of Mars.' The clouds are mostly ice crystals and they appear blue in color in this image from NASA's Mars Odyssey.
Streaks on Opportunity Solar Panel After Uphill Drive
This image from the navigation camera on the mast of NASA's Mars Exploration Rover Opportunity shows streaks of dust or sand on the vehicle's rear solar panel after a series of drives during which the rover was pointed steeply uphill.
A shadow and wheel tracks of NASA's Mars Exploration Rover Opportunity appear in this image taken by a rear hazard avoidance camera (hazcam) just after a drive on a slope above Endeavour Crater on March 22, 2016.
The North Polar layered deposits provide a record of recent climate changes on Mars as seen by NASA's Mars Reconnaissance Orbiter spacecraft. Color variations between layers are due to differences in composition of the dust.
This image was targeted for NASA's Mars Reconnaissance Orbiter spacecraft to look at a candidate new crater on a lobate apron. Such aprons are often ice-rich, but the crater shows no bright material that would indicate ice.
Alluvial fans are gently-sloping wedges of sediments deposited by flowing water. Some of the best-preserved alluvial fans on Mars are in Saheki Crater, seen here by NASA's Mars Reconnaissance Orbiter spacecraft.