Mars may have been a "blue planet" with an ocean the size of today's Arctic Ocean, a new study suggests.

The Red Planet may have once been half blue. A sea the size of Earth’s Arctic Ocean blanketed part of Mars about three ...

Mars, the planet we see today—arid, cold, and covered in red dust—may have once been a "blue planet" with a vast ocean that ...

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

"The structures that we were able to identify in the images are clearly the mouth of a river into an ocean." The post ...

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

Mars today is a frozen, dusty desert. But if you look deep inside Valles Marineris, the largest canyon system on Mars and in the Solar System, you find familiar landforms. They resemble river deltas, ...

Using images from cameras on Mars orbiters, an international research team has discovered structures on Mars that are very similar to classic river deltas on Earth. These are traces of rivers that ...

Scientists have discovered evidence of a massive ancient ocean on Mars, providing new insights into the planet's history when it was abundant with water.

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 ...

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.