NASA’s Opportunity rover uncovered mineral patterns and geological layers that matched formations created by water on Earth.

Liquid water once shaped the Martian landscape dramatically, carving valleys, filling lakes, and forming vast oceans. Billions of years ago, during Mars' early days known as the Noachian and Hesperian ...

Ancient Mars boasted abundant water, but the cold and dry conditions of today make liquid water on the Red Planet seem far ...

Skylights, openings in the surface of Mars that descend down into caves, have been found on Mars, along with signatures for ...

Cemented dunes in Gale Crater reveal evidence of late-stage water that may have preserved organic signals beneath the Martian ...

We were as excited as anyone when MARSIS (the Mars Advanced Radar for Subsurface and Ionosphere Sounding) experiment announced there was possibly liquid water under the southern polar ice cap. If ...

For decades, scientists have theorized about how Mars reached its current state. Many believe that the Red Planet's surface may have once been covered in rivers and oceans. But, if that's really the ...

Scientists have found seismic clues that suggest liquid water may be hiding beneath Mars' surface. By listening to the echoes of "marsquakes" — seismic waves rippling through Mars' crust — researchers ...

New research suggests Mars' slope streaks are the result of wind and dust, not water. © NASA/JPL-Caltech/University of Arizona In 1976, NASA’s Viking mission ...