This image from NASA's Mars Reconnaissance Orbiter shows barchan sand dunes, common on Mars often forming vast dune fields within very large (tens to hundreds of km) impact basins. The regions upwind of barchans are usually devoid of sandy bedforms.
May 14, 2018
This color image from NASA's Mars Reconnaissance Orbiter (MRO) shows bedrock layers of diverse colors and composition.
May 10, 2018
This enhanced color image from NASA's Mars Reconnaissance Orbiter (MRO) shows the heavily channeled and ancient southern highlands of Mars. The elongated and jagged features are windblown dunes, perhaps hardened and eroded.
April 30, 2018
NASA's Opportunity rover has spent 13 years exploring a small region of Meridiani Planum which has a rather ordinary appearance as seen by NASA's Mars Reconnaissance Orbiter.
April 30, 2018
This enhanced color image from NASA's Mars Reconnaissance Orbiter shows eroded bedrock on the floor of a large ancient crater.
April 30, 2018
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
