Edited Mars Reconnaissance Orbiter Image of sand dunes and hills.

Edited Mars Reconnaissance Orbiter image of a linear valley filled in by sand and rocks. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of the ice surface of the Martian south polar residual ice cap.

Edited Mars Reconnaissance Orbiter image of sand dunes named La Jolla. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of intersecting channels near Olympica Fossae.

Edited Mars Reconnaissance Orbiter image of a crater on Mars with a dune field in its middle situated such that it resembles a huge cat eye staring back at MRO. Grayscale (red channel) context image.

Edited Mars Reconnaissance Orbiter context image of of hills (and a nice crater) and swirls in the Hellas Planitia region of Mars. Processing variant.

Edited Mars Reconnaissance Orbiter image of sand dunes in Hyperborei Cavi. (I love Martian names.)

Edited Mars Reconnaissance Orbiter image of part of Innsbruck Crater.

Edited Mars Reconnaissance Orbiter image of gullies in a crater on Mars. Color variant.

Edited Mars Reconnaissance Orbiter image of part of Hellas Planitia with polygonal surface features.

Edited Mars Reconnaissance Orbiter image of scarps on a slop that expose ice underneath the Martian surface. (I assume the ice is water, not carbon dioxide, but I didn't read the caption very carefully.) Color/processing variant.

Edited Mars Reconnaissance Orbiter image of a scarp along the edge of Chasma Boreale.

Edited Mars Reconnaissance Orbiter image of a dark slope streak on Mars. The dark streak is nothing more than an area of a lack of brighter dust, which will be filled in by the ambient dust in the atmosphere over time. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of a sand dune field over layers of bedrock on Mars. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of plains on Mars with some strange bumps and markings, looking like badly dried plaster.

Edited Mars Reconnaissance Orbiter image of bedrock in Meridiani Planum. Color variant.

Edited Mars Reconnaissance Orbiter image of a crater on Mars with a dune field in its middle situated such that it resembles a huge cat eye staring back at MRO. Grayscale (red channel) context image. Processing variant.

Edited Mars Reconnaissance Orbiter image of martian terrain and landforms.

Edited Mars Reconnaissance Orbiter image of a scene on Mars.

Edited Mars Reconnaissance Orbiter image of sand on the floor of Pasteur Crater. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of changes (from an earlier image) in sand dunes in Syrtis Major. Color variant.

Edited Mars Reconnaissance Orbiter image of a small crater with possible phyllosilicates in its ejecta.

Edited Mars Reconnaissance Orbiter image of the wall of a crater immediately north of Xainza Crater.

Edited Mars Reconnaissance Orbiter image of part of the Martian south polar cap.

Edited Mars Reconnaissance Orbiter image of the Zea Dorsa region of Mars.

Edited Mars Reconnaissance Orbiter image of a long scarp on Mars.

Edited Mars Reconnaissance Orbiter image of sand dunes and mesas in Iani Chaos on Mars. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of layered bedrock in the Meridiani Region.

Edited Mars Reconnaissance Orbiter image of cracked terrain on Mars. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of the landing site of Opportunity (which landed on Mars in 2004).

Edited Mars Reconnaissance Orbiter image of a section of bedrock on Mars along with hills and sand dunes. Processing variant.

Edited Mars Reconnaissance Orbiter image of the landing site of Opportunity (which landed on Mars in 2004). Color variant.

Edited Mars Reconnaissance Orbiter image of a pit on Mars. Cropped, processing variant that lets you see the bottom.

Edited Mars Reconnaissance Orbiter image of dune gullies in Kaiser Crater.

Edited Mars Reconnaissance Orbiter image of a colorful crater on Mars. Made even more colorful after being seen through the eyes of Photoshop.

Edited Mars Reconnaissance Orbiter image of a colorful crater on Mars.

Edited Mars Reconnaissance Orbiter image of a crater in Daedalia Planum.

Edited Mars Reconnaissance Orbiter image looking for frost on the rim of Corozal Crater - it's thought that frost may play a roll in the creation of gullies. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of the slopes of Nectaris Montes, being monitored for changes.

Edited Mars Reconnaissance Orbiter image of sandstone in west Candor Chasma on Mars. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of sand dunes on Mars. Color/processing variant.

Edited Mars Reconnaissance Orbiter image of the central uplift of a crater near Pettit Crater.

Edited Mars Reconnaissance Orbiter image of an impact crater on Mars north of Valles Marineris. Cropped variant.

Edited Mars Reconnaissance Orbiter image of a low albedo (reflectence) slope in Coprates Chasma.

Edited Mars Reconnaissance Orbiter image of a part of Kasei Valles on Mars. Red channel.

Edited Mars Reconnaissance Orbiter image of sand dunes in Hyperborei Cavi. (I love Martian names.) Color/processing variant.

Edited Mars Reconnaissance Orbiter image of pits and sand dunes in Hale Crater.

Edited Mars Reconnaissance Orbiter image of a high-latitude intracrater deposit. Color/processing variant in an attempt to bring out details.

Edited Mars Reconnaissance Orbiter image of a channel on Sacra Mensa.