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

NASA astronaut Suni Williams has retired after a legendary 27-year career that included 608 days in space, nine spacewalks, and two stints commanding the International Space Station.

Researchers have uncovered surprising evidence that the deep ocean’s carbon-fixing engine works very differently than long assumed. While ammonia-oxidizing archaea were thought to dominate carbon ...

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

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

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

Mars, long viewed as a cold and arid world, may have once been covered in vast stretches of open water.

Mars may have once possessed an ocean at least as large as Earth's Arctic Ocean, a new study suggests. Previous research ...

Mars today is a frozen, dusty desert. But if you look deep inside Valles Marineris, the largest canyon system on Mars and in ...

With Artemis II, SLS could become the most powerful rocket ever to launch humans. Its four main engines burn roughly 700,000 ...

NASA’s SpaceX Crew-11 mission returned safely to Earth after 167 days in orbit, completing hundreds of hours of research ...

Mars not only had rivers, but also a huge ocean billions of years ago. Scientists have now found evidence of a large body of ...