By Will Dunham WASHINGTON, April 15 (Reuters) - There is a lot of evidence from orbiting satellites and surface rovers ...

Caltech researchers have identified geological features on Mars that could point to the existence of a long-dried ocean that ...

New research suggests Mars once had a vast ocean, indicated by a 'bathtub ring' marking its possible shoreline. Utilizing ...

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Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. An illustration of Mars as ...

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.

Three billion years ago, you could have stood on Mars and watched a river spill into a sea. That picture is still speculative, but new evidence makes it harder to dismiss. Researchers at the ...

The red planet was half blue, according to space scientists. A research team using images from cameras on Mars-orbiting spacecraft say it was a "blue planet" around three billion years ago – with an ...

CAPE CANAVERAL, Fla. — Mars may be drenched beneath its surface, with enough water hiding in the cracks of underground rocks to form a global ocean, new research suggests. The findings released Monday ...