This non-circular pit seen in this image from NASA's Mars Reconnaissance Orbiter is due to a low angle impact from an asteroid or comet. The raised plateau west of the crater was where most of the impact debris landed.
This particular area, called Mangala Valles and located near the Tharsis region, may be an example of the action of liquid water in the ancient Martian past. This image is from NASA's Mars Reconnaissance Orbiter.
The North Polar region of Mars is capped with layers of water ice and dust, called the 'polar layered deposits.' This permanent polar cap is covered in the winter with a layer of seasonal carbon dioxide ice as seen by NASA's Mars Reconnaissance Orbiter.
The small hill in this image aptured by NASA's 2001 Mars Odyssey spacecraft of Amazonis Planitia has several dark slope streaks, believed to form when down slope movement of rocks or other debris clear off some of the dust cover.
Curiosity's View of 'Cooperstown' Outcrop on Route to Mount Sharp
The low ridge that appears as a dark band below the horizon in the center of this scene is a Martian outcrop called 'Cooperstown,' a possible site for contact inspection with tools on the robotic arm of NASA's Mars rover Curiosity.
This image shows another portion of Ravi Vallis. In this image taken by NASA's 2001 Mars Odyssey spacecraft, a small crater and the resistant material formed during the impact form a 'donut' on the floor of the valley.
The channel shown here is part of a large system of depressions located on the eastern side of the Elysium Mons volcanic complex. The depression in this image from NASA's 2001 Mars Odyssey spacecraft is located just south of Albor Tholus.
This image captured by NASA's 2001 Mars Odyssey spacecraft shows several of the channels located in the Elysium Mons volcanic complex. It is likely that these channels were formed by lava flow rather than water.
Sinuous Ridge Cutting Across Geologic Units of the Medusae Fossae Formation
Shown here is an exceptionally long sinuous ridge, possibly an inverted fluvial feature, that cuts across newly mapped geologic units of the Medusae Fossae Formation, from NASA's Mars Reconnaissance Orbiter.
Mars Hand Lens Imager Sends Ultra High-Res Photo from Mars
This image of a U.S. penny on a calibration target was taken by the Mars Hand Lens Imager (MAHLI) aboard NASA's Curiosity rover in Gale Crater on Mars. At 14 micrometers per pixel, this is the highest-resolution image that MAHLI can acquire.