Scientists believe they found fresh proof of an ancient ocean on Mars in the form of a “bathtub ring” it left after it dried ...

"The possible existence of an ocean suggests that a large body of water may have persisted for a long time. That could have ...

A new map reveals a blue Mars three billion years ago and strengthens the evidence of an ancient ocean that covered much of ...

Mars has long puzzled scientists. Dry riverbeds, mineral traces, and layered rocks hint at a wetter past. For decades, ...

The ancient ocean on Mars probably occupied a third of its surface.

There is a lot of evidence from orbiting satellites and surface rovers indicating that liquid water was present long ago on ...

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 ...

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 ...

Mars may have once possessed an ocean at least as large as Earth's Arctic Ocean, a new study suggests. Previous research suggested rivers and seas once existed on Mars, raising the question of whether ...

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.

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 ...