Artist concept of Mars Reconnaissance Orbiter

NASA's Phoenix Mars Lander, its backshell and its heatshield are visible within this enhanced-color image of the Phoenix landing site taken on Jan. 6, 2010 by the High Resolution Imaging Science Ex...

Gullies and Flow Features along Crater Wall in Promethei Terra

This April 6, 2014, image from the Context Camera on NASA's Mars Reconnaissance Orbiter was taken as a follow-up to discovery of a possible 2012 impact scar in images from the orbiter's Mars Color ...

The Mars Reconnaissance Orbiter has seen many places on the planet. One of the most interesting is one of the great canyon systems on Mars.

This false-color animation simulates a fly-around look at one of the places on Mars where dark streaks advance down slopes during warm seasons, possibly involving liquid water or brine. This site i...

Overview map showing the location of the study area within Aeolis Dorsa (star).

This terrain is covered by pits and scallops (pits open on one side), perhaps due to collapse after sublimation of subsurface ice.

Planum Australe Region

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

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 crater is named for G. Edward Danielson, Jr. who was instrumental in the development of a series of Mars cameras, from Mariner 4 launched in 1964 to the Mars Global Surveyor launched in 1996.

The HiRISE camera on the Mars Reconnaissance Orbiter is the most powerful telescope to have left Earth orbit. HiRISE is capable of some interesting astronomical observations such as this image of J...

With the spacecraft safely captured into orbit, the Mars Reconnaissance Orbiter team transitions to the next critical phase -- aerobraking. Learn how engineers slow the spacecraft and precisely sha...

This artist's animation shows how NASA's Curiosity rover will communicate with Earth via two of NASA's Mars orbiters, Mars Reconnaissance Orbiter and Odyssey. As the rover descends to the surface o...

The battered region of Arabia Terra is among the oldest terrain on Mars.

This artist's concept of the Mars Reconnaissance Orbiter features the spacecraft's main bus facing down, toward the red planet.

In this Mars Reconnaissance Orbiter view of the Curiosity rover mission's waypoint called "the Kimberley," the red dot indicates the location of a sandstone target, "Windjana," selected for close-u...

This image taken on May 19, 2010, shows an impact crater that had not existed when the same location on Mars was previously observed in March 2008.

Polygonal Ridge in Gordii Dorsum Region, Mars

This image shows part of Ladon Vallis, a long outflow channel found in the Southern Highlands on Mars.

This image from the HiRISE camera on NASA's Mars Reconnaissance Orbiter shows a location associated with the novel and movie, "The Martian." It is the tale's planned landing site for the Ares 4 mis...

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 close-up image of a dust storm on Mars was acquired by the Mars Color Imager instrument on NASA's Mars Reconnaissance Orbiter on Nov. 7, 2007.

Seasons change even on Mars and NASA's fleet of explorers are helping scientists learn more about the effects on the Red Planet.