Ancient shoreline features hint that water on Mars once formed a vast ocean.

Three billion years ago, you could have stood on Mars and watched a river spill into a sea. That picture is still speculative ...

Scientists have traced ancient Martian shorelines inside a giant canyon, revealing where a vast ocean once stood and why ...

Mars today is a frozen, dusty desert. But if you look deep inside Valles Marineris, the largest canyon system on Mars and in ...

New research suggests Mars was once a blue planet, as scientists identify river deltas and signs of a vast ancient ocean on ...

Spacecraft orbiting the Red Planet have helped researchers map out an ancient coastline that surrounded a large ocean billions of years ago ...

Using images from cameras on Mars orbiters, an international research team has discovered structures on Mars that are very ...

The red planet was half blue, according to space scientists. A research team using images from cameras on Mars-orbiting ...

Data collected by China’s Zhurong rover has provided new evidence that Mars may once have hosted large oceans. Subsurface ...

Billions of years ago, water flowed across Mars. Most scientists agree the red planet had rivers. But did those rivers flow into an ocean? New research from the University of Arkansas found strong ...

FAYETTEVILLE, Ark. — Researchers at the University of Arkansas have recently discovered geological formations on Mars that suggest the past presence of large rivers that once flowed into an ocean.

Mars had an Arctic-sized ocean, and scientists are only now beginning to see the outline of it. For a long time, the planet ...