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A variety of landforms, including isolated hills, eroded mesas, dark eroded sediments, and dunes are seen within an area called "Aram Chaos."

Amazingly, this HiRISE image has captured at least four avalanches, or debris falls, in action.

Artist's concept of Mars Reconnaissance Orbiter approaching Mars.

This movie begins with an animation (artist's rendering) of NASA's Mars Reconnaissance Orbiter spacecraft above Mars. The scene zooms into an "X-ray" view of the spacecraft, revealing the High Reso...

A regional dust storm visible in the southern hemisphere of Mars in this nearly global mosaic of observations made by the Mars Color Imager on NASA's Mars Reconnaissance Orbiter on Nov. 25, 2012.

This image, taken by HiRISE, shows a lobate tongue on the Northwest Hellas rim.

Cydonia Labyrinthus is a complex of intersecting valleys that form a polygonal fractured terrain.

Two types of wind-blown sedimentary deposits are pictured in this scene of the floor of Ius Chasma in the Valles Marineris.

The arm and the remote sensing mast of the Mars rover Curiosity each carry science instruments and other tools for NASA's Mars Science Laboratory mission.

The material in the upper portion of this image, perhaps hardened volcanic ash deposits, is being eroded into parallel long, thin ridges called yardangs by the strong prevailing winds.

What triggered a Martian landslide? Landslides are common features in canyons on both Earth and Mars, and they happen the same way.

This image, acquired on May 13, 2018 by NASA's Mars Reconnaissance Orbiter, shows sand dunes scouring what appears to be a highly-cratered, old lava flow in the Tempe Terra region, located in the N...

This enhanced image shows the inside of a rimless pit about 310 meters (1,017 feet) in diameter, northwest of the mountain Ascraeus Mons in the northern hemisphere of Mars.

This map shows the route driven by NASA's Mars rover Curiosity through the 29th Martian day, or sol, of the rover's mission on Mars (Sept. 4, 2012).

Tantalus Fossae are a set of faults on the eastern flank of Alba Mons, one of the great Tharsis Montes volcanoes. Here a fault cuts into this crater, indicating that the fault formed after the crat...

Although the season is late spring, carbon dioxide ice still covers much of the surface at this high latitude site.

This image from NASA's Mars Reconnaissance Orbiter (MRO) shows sand dunes on the slopes of Nectaris Montes within Coprates Chasma.

This image covers plains near Aureum Chaos.

This map shows the route driven by NASA's Mars rover Curiosity through the 43rd Martian day, or sol, of the rover's mission on Mars (Sept. 19, 2012).

More evidence of a dynamic Mars is revealed at the edge of a martian dune field.

This map shows the thickness of the north polar layered deposits on Mars as measured by the Shallow Radar instrument on NASA's Mars Reconnaissance Orbiter.

This image, taken with the High Resolution Imaging Science Experiment (HiRISE) camera, shows a mesa within the "Murray Buttes" area on Mars showing a complex fracture pattern (black arrow) protrudi...

These images from the Context Camera on NASA's Mars Reconnaissance Orbiter were taken before and after an apparent impact scar appeared in the area in March 2012. Comparing the Jan. 16, 2012, image...

This series of images shows carbon dioxide ice sublimating (going directly from a solid to a gas) inside a pit at Mars' south pole. Each frame of the animation was taken by the HiRISE camera on NAS...

The bright linear features cutting the bedrock in the center region of this image look like mineral veins.