Beneath the surface of Mars, a large hidden ocean that could harbor life was discovered. Scientists used seismic data collected by NASA’s InSight lander to locate the underground reservoir ...

A new study of Mars' gravitational field has revealed mysterious structures hiding beneath the sediment layers of a lost ocean. Experts still aren't sure what they are or how they formed.

Map highlighting the dense gravitational structures in the northern hemisphere (main) and stock image of Mars (inset).

A recently released set of topography maps provides new evidence for an ancient northern ocean on Mars. The maps offer the strongest case yet that the planet once experienced sea-level rise ...

Most of the ocean's depths have never been seen by human eyes or even mapped accurately, leaving vast swaths of seafloor essentially undiscovered. So how much of the ocean have we actually explored?

Mars may be around 140 million miles away from Earth, but the red planet is influencing our oceans, according to new research.

Bob McDonald's blog: It has long been suspected that liquid water once flowed on Mars. Now the latest research shows that billions of years ago, Mars had a deep ocean covering hundreds of ...

What do we really know about the deep ocean? Whether Earth’s ocean is an ecological paradise teeming with wildlife or a mysterious, stormy underworld hiding mythological sea monsters, it goes ...

Seismic analysis of data from NASA’s InSight lander could be a remnant of Mars’ watery past and raise prospects for life below Mars’ surface.

A new analysis of data collected by NASA’s InSight mission suggests there may be enough water beneath the surface of Mars to cover the planet.

Mars may be around 140 million miles away from Earth, but the red planet is influencing our deep oceans by helping drive “giant whirlpools,” according to new research. Scientists analyzed ...

A recently released set of topography maps provides new evidence for an ancient northern ocean on Mars. The maps offer the strongest case yet that the planet once experienced sea-level rise ...