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

New evidence of ancient rivers suggests Mars may have been a "blue planet," thanks to an ocean spanning its entire northern ...

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

Researchers worked out the ocean's size by finding how high the water level got in the Solar System’s largest canyon system.

Mars is absolutely dripping with evidence that the red planet was once a striking blue, complete with glistening lakes, ...

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

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

Scientists from New York University Abu Dhabi (NYUAD) have uncovered new evidence that water once flowed beneath the surface of Mars, revealing that the planet may have remained habitable for life ...

'Because the ice is thin and temporary, it would leave little evidence behind, which could explain why rovers have not found ...

F.D. Flam is a Bloomberg Opinion columnist covering science. She is host of the “Follow the Science” podcast.

Networks of narrow channels lining the surface of Martian dunes, called “gullies,” have puzzled astronomers for decades. Now, as detailed in a new paper published in the journal Geophysical Research ...