NASA's Mars Reconnaissance Orbiter shows bright ripples line the topography in this region, formed within a past climate. Dark dunes and sand streaks, composed of basaltic sand, have moved and filled lower areas, pushed by more recent winds.
April 2, 2018
This image from NASA's Mars Reconnaissance Orbiter shows a roundish crater with three channels breaching the rim and extending to the south. The crater has been filled by sediments and may have been an ancient lake.
April 2, 2018
This image from NASA's Mars Reconnaissance Orbiter is a close-up of a trough, along with channels draining into the depression. On the floor of the trough is some grooved material typically seen in middle latitude regions where there has been glacial flow
April 2, 2018
Gullies on Martian sand dunes, like these in Matara Crater, have been very active, with many flows in the last ten years. In this image from NASA's Mars Reconnaissance Orbiter frost in and around two gullies are seen.
April 2, 2018
This image from NASA's Mars Reconnaissance Orbiter (MRO) shows the western wall of a small pit that is located along the floor of a larger trough in Coprates Catena. Dark layers line the bottom; light-toned layers are near the top.
March 6, 2018
Shown in this image from NASA's Mars Reconnaissance Orbiter are alluvial fans, fan-shaped deposits emerging from regions of steep topography. Alluvial fans on Mars are thought to be ancient and record past episodes of flowing water.
March 6, 2018
This observation from NASA's Mars Reconnaissance Orbiter shows a set of straight ridges in ancient bedrock near Nirgal Valles. The patterns indicate fractures from tectonic stresses.
March 6, 2018
Shown in this image from NASA's Mars Reconnaissance Orbiter are fan-shaped deposits emerging from regions of steep topography called alluvial fans. Alluvial fans on Mars are thought to be ancient and record past episodes of flowing water.
March 6, 2018
This image shows the location of NASA's Mars Phoenix Lander and related hardware around the mission's May 25, 2008, landing site on far-northern Mars as seen by NASA's Mars Reconnaissance Orbiter.
February 20, 2018
This image from NASA's Mars Reconnaissance Rover shows the edge of a mound of ice in one of the mid-latitude craters. Scientists now realize that ice is very common on the Martian surface.
February 20, 2018
This animation blinks between two images of NASA's Mars Phoenix Lander hardware around the mission's 2008 landing site on far-northern Mars. By late 2017, dust obscures much of what was visible two months after the landing. The lander is near the top; the back shell and parachute near the bottom.
February 20, 2018
These two frames were taken of the same place on Mars by the same orbiting camera onboard NASA's Mars Reconnaissance Orbiter before (left) and after some images from the camera began showing unexpected blur.
February 9, 2018
An enhanced-color image from NASA's Mars Reconnaissance Orbiter (MRO) reveals bedrock that is several kilometers below the top of the giant Valles Marineris canyons.
February 5, 2018
Intricate gullies have formed on the northern wall of this impact crater located in the Terra Cimmeria region in this image from NASA's Mars Reconnaissance Orbiter (MRO).
February 5, 2018
This image from NASA's Mars Reconnaissance Orbiter (MRO) shows streaks forming on slopes when dust cascades downhill. The dark streak is an area of less dust compared to the brighter and reddish surroundings.
February 5, 2018
