lava-leaking scar on Mars larger than our own Grand Canyon. Dubbed the Aganippe Fossa, the 373-mile long crack in Mars’ surface, is a graben — a “ditch-like groove with steep walls on either ...

Researchers have found new evidence for a massive subsurface ocean on Mars, again raising the possibility of microbial life.

orbits Mars every 30 hours and is less than 10 miles across. Its larger sibling Phobos bears many scars, including craters and deep grooves running across its surface. Scientists have long debated ...

But today Mars is cold and dry, with most water now located below the surface. Understanding how much water is stored offers critical information for energy exploration, as well as life ...