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
This animation blinks between two images of NASA's Mars Phoenix Lander hardware around the mission's 2008 landing site on far-northern Mars. By late 2017, dust obscures much of what was visible two months after the landing. The lander is near the top; the back shell and parachute near the bottom.
February 20, 2018
These two frames were taken of the same place on Mars by the same orbiting camera onboard NASA's Mars Reconnaissance Orbiter before (left) and after some images from the camera began showing unexpected blur.
February 9, 2018
An enhanced-color image from NASA's Mars Reconnaissance Orbiter (MRO) reveals bedrock that is several kilometers below the top of the giant Valles Marineris canyons.
February 5, 2018
Intricate gullies have formed on the northern wall of this impact crater located in the Terra Cimmeria region in this image from NASA's Mars Reconnaissance Orbiter (MRO).
February 5, 2018
This image from NASA's Mars Reconnaissance Orbiter (MRO) shows streaks forming on slopes when dust cascades downhill. The dark streak is an area of less dust compared to the brighter and reddish surroundings.
February 5, 2018
This image from NASA's Mars Reconnaissance Orbiter (MRO) shows an impact crater looking amusingly like a tadpole because of the valley that was carved by water that used to fill it.
February 5, 2018
This graph shows rising air during a 2007 global dust storm on Mars lofted water vapor into the planet's middle atmosphere based on data from the Mars Climate Sounder instrument onboard NASA's Mars Reconnaissance Orbiter.
January 23, 2018
This image from NASA's Mars Reconnaissance Orbiter shows hexagons in icy terrain. Polygonal patterns form by winter cooling and contraction cracking of the frozen ground.
January 23, 2018
This image from NASA's Mars Reconnaissance Orbiter shows blocks of layered terrain within the Olympus Mons aureole. The aureole is a giant apron of chaotic material around the volcano.
January 23, 2018
Layers, probably sedimentary in origin, have undergone extensive erosion in this image from NASA's Mars Reconnaissance Orbiter (MRO) of Shalbatana Valles, a prominent channel that cuts through Xanthe Terra.
January 23, 2018
Ladon Basin was a large impact structure that was filled in by the deposits from Ladon Valles, a major ancient river on Mars as seen in this image from NASA's Mars Reconnaissance Orbiter (MRO).
January 23, 2018
Two 2001 images from NASA's Mars Global Surveyor orbiter show a dramatic change in the planet's appearance during a dust storm.
January 23, 2018
