Scientists have traced ancient Martian shorelines inside a giant canyon, revealing where a vast ocean once stood and why ...

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

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

"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 ...

Each year, vast blooms of phytoplankton spread across the Southern Ocean, drawing carbon dioxide from the atmosphere and ...

Redwing is autonomous underwater glider expected to circle the world in a little over four years, then return to Cape Cod.

Scientists exploring the South China Sea's Dragon Hole, a deep underwater sinkhole, discovered a thriving microbial world and ...

Europa has a deep ocean, but a new study suggests its seafloor may be too quiet to supply the energy life needs to survive.

For most of modern history, the open ocean has been treated as a place apart. Beyond the 200-nautical-mile limits of national ...

Beneath Antarctica’s Ross Ice Shelf is a hidden ocean – a vast, dark cavity roughly twice the volume of the North Sea.

The world’s first legally binding agreement to protect marine life in international waters takes effect Saturday ...