Ares Vallis, where the real-life Pathfinder is right now, is a channel on Mars ... water-infused clay, which is why scientists are especially interested in studying regions like this. The photo ...

New findings suggest Mars’ underground water reserves may be far less extensive than earlier research indicated.

Seismic readings of the interior of Mars strongly suggest large quantities of water buried 6 to 12 miles underground. Persuasive new evidence supporting the possibility of liquid water deep ...