This image from NASA's Mars Reconnaissance Orbiter shows one of two spots that likely appeared in connection with the Oct. 19, 2016, arrival of ESA's Schiaparelli test lander. An animation is available at the Photojournal.
Martian 'Spiders' in Sharper Look, Thanks to Volunteers
This image from NASA's Mars Reconnaissance Orbiter shows spidery channels eroded into Martian ground. This terrain type, called spiders or 'araneiform' (from the Latin word for spiders), appears in some areas of far-southern Mars.
This image from NASA's Mars Reconnaissance Orbiter shows some beautiful lava flows in Amazonis Planitia. Lava isn't moving around on Mars today, but it certainly once did, and images like this one are evidence of that.
The Tharsis region of Mars is covered in vast lava flows, many with channels, as seen by NASA's Mars Reconnaissance Orbiter. Some channels, however, resemble features that may have been formed by water.
Outflow Stream from Relatively Recent Martian Lake
This image taken by NASA's Mars Reconnaissance Orbiter covers an area about 8 miles wide in the northern Arabia Terra region of Mars. Researchers estimate the stream and the lakes it linked held water at some time in the range of 2-3 billion years ago.
This image from NASA's Mars Reconnaissance Orbiter shows many small craters over a larger degraded one in the northern lowlands. These small craters are smoother and shallower than their counterparts closer to the equator.