NASA astronauts Sunita Williams and Barry Wilmore have been stranded aboard the International Space Station for nearly nine months after their return trip on Boeing’s Starliner was deemed unsafe.

The replacement crew of the SpaceX Dragon capsule, sent on a mission to retrieve two astronauts stranded at the International ...

Talk about an out of this world greeting! On Sunday, March 16, as SpaceX and NASA's Crew-10 astronauts arrived at the International Space Station ahead of Crew-9's return home, some friendly space ...

Giorgio A. Tsoukalos talks about the Alien Astronaut Theory & the new episodes of "Ancient Aliens" on The History Channel.

The Artemis II mission, which could launch as early as February, is expected to send four astronauts on a trip to the moon, ...

Britain's first astronaut thinks aliens exist and she says they could be already living among us, but we can't see them. Helen Sharman is a chemist who currently works at the Imperial College in ...