Martian ground slips away into Ganges Chasm, one of many deep troughs that make up the vast Valles Marineris. Valles Marineris (Mariner Valley) is the largest known canyon in the solar system, 7 times deeper than the Grand Canyon and as long as the distance from New York to Los Angeles. It slices across the Martian landscape just south of its equator.
This image was taken with the HiRISE camera aboard the Mars Reconnaissance Orbiter. Its hi-res sensors are capable of resolving objects as small as three feet across from its orbital position 179 miles away. Click the image above to view an even more detailed version.
Check out the video section at right for a dramatic flyover view of Mariner Valley.
Credit: NASA/JPL/University of Arizona