Wrinkle Ridge in Solis Planum

This image shows an example of layers in the Martian north polar deposits. These deposits, part of the Planum Boreum dome, are composed mainly of water ice and small amounts of dust.

This picture of a heart-shaped feature in Arabia Terra on Mars was taken on May 23, 2010, by the Context Camera (CTX) on NASA's Mars Reconnaissance Orbiter.

A region known as "Cape York" on the western rim of Endeavour Crater, where NASA's Mars Exploration Rover Opportunity worked for 20 months, is highlighted in these images.

This diagram illustrates an interpretation for the origin of some deposits in the Eridania basin of southern Mars as resulting from seafloor hydrothermal activity more than 3 billion years ago.

Dunes on Floor of Samara Valles, Mars

Northern Hemisphere Gullies on West-Facing Crater Slope, Mars

This view of a portion of the Eridania region of Mars shows blocks of deep-basin deposits that have been surrounded and partially buried by younger volcanic deposits. The image was taken by the Con...

This artist's concept of NASA's Mars Reconnaissance Orbiter at Mars features one of its instruments -- the Mars Climate Sounder -- in action.

On Nov. 1, 2016, the HiRISE camera on NASA's Mars Reconnaissance Orbiter observed the impact site of Europe's Schiaparelli test lander, gaining the first color view of the site since the lander's O...

Polygons are of great interest because they often indicate the presence of shallow ice or of desiccation such as in a mud flat. However, nature sometimes seems too clever for us.

This HiRISE image shows a group of cones, shield-like features, and round mounds.

A towering dust devil casts a serpentine shadow over the Martian surface in this image acquired by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.

This color image from NASA's Mars Reconnaissance Orbiter (MRO) shows bedrock layers of diverse colors and composition.

This image shows part of the floor of an impact crater on the northern rim of the giant Hellas Basin.

This cliff is the site of the most frequent frost avalanches seen by HiRISE. These avalanches remind us, along with active sand dunes, dust devils, slope streaks and recurring slope lineae, that ...

Countdown Nears: Final Tests

Gullied Crater Slope with Rocky Outcrops Northeast of Hellas Region

This HiRISE image shows erosional features formed by seasonal frost near the south pole of Mars.

A dramatic, fresh impact crater dominates this image taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter on Nov. 19, 2013.

Nili Patera is a region on Mars in which dunes and ripples are moving rapidly. HiRISE continues to monitor this area every couple of months to see changes over seasonal and annual time scales.

This HiRISE image covers the southwest portion of the terraces and floor of Holden Crater situated in southwest Margaritifer Terra.

This scene shows dark sand dunes marching over the ridges created by an alluvial (water-deposited) fan in an impact crater.

This image from the NASA Mars Reconnaissance Orbiter shows an impact scar on Mars made by pieces of the NASA Mars Science Laboratory spacecraft that the spacecraft shed just before entering the Mar...

Aram Chaos is a heavily eroded impact crater that contains jumbled blocks of material disrupted when large quantities of ice or water were catastrophically removed. The light toned sediments may ha...

This map shows the route driven by NASA's Curiosity Mars rover from the location where it landed in August 2012 to its location in December 2016, which is in the upper half of a geological unit cal...