Syrtis Major Region

These dark streaks, also known as “slope streaks,” resulted from dust avalanches in an area of Mars called Acheron Fossae. The HiRISE camera aboard NASA’s Mars Reconnaissance Orbiter captured them ...

Drainage Near Crater in Terra Sabaea.

This sequence of three HiRISE images from NASA's Mars Reconnaissance Orbiter shows the growth of a branching network of troughs carved by thawing carbon dioxide over the span of three Martian years...

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 animation shows the position of NASA's Curiosity rover as it journeyed through "the clay-bearing unit" on Mars between May 31 and July 20, 2019. The HiRISE camera on NASA's Mars Reconnaissance...

Sample Noachis Terra

This inner slope of a Martian crater has several of the seasonal dark streaks called "recurrent slope lineae," or RSL, that a November 2017 report interprets as granular flows, rather than darkenin...

This image, taken Jan. 26, 2012, shows the back shell of NASA's Phoenix Mars Lander spacecraft after its second Martian arctic winter.

The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter took two images of the larger of Mars' two moons, Phobos, within 10 minutes of each other on Mar...

This impact crater has gullies incised into its walls on the north and eastern sides. A couple of gullies on the north wall are unusual because a segment in the middle becomes wider than the upslop...

This image acquired on November 30, 2018 by NASAs Mars Reconnaissance Orbiter, shows a complex crater, where we see bedrock in several locations from different depths in the crust.

Mars's seasonal polar caps are composed primarily of carbon-dioxide frost.

Mysterious features on slopes hint there could be water flows on Mars.

This series of images shows warm-season features that might be evidence of salty liquid water active on Mars today.

NASA's Mars Reconnaissance Orbiter, nearing the 10th anniversary of its arrival at Mars, used its High Resolution Imaging Science Experiment (HiRISE) camera to obtain this view of an area with unus...

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

Artist's concept of Mars Reconnaissance Orbiter

This image, acquired on May 15, 2018, by NASA's Mars Reconnaissance Orbiter, shows relatively bright mounds scattered throughout darker and diverse surfaces in Chryse Planitia.

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.

This area at the base of Mount Sharp on Mars includes a pale outcrop, called "Pahrump Hills," that NASA's Curiosity Mars rover investigated from September 2014 to March 2015, and the "Artist's Driv...

Back-and-forth blinking of this two-image animation shows movement of ripples covering a sand dune on Mars.

NASA's Curiosity Mars rover and tracks from its driving are visible in this view from orbit, acquired on April 11, 2014, by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's ...

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...

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

Two parallel tracks left by the wheels of NASA's Curiosity Mars rover cross rugged ground in this portion of a Dec. 11, 2013, observation by the High Resolution Imaging Science Experiment (HiRISE) ...