Harvard's Avi Loeb challenges NASA's natural comet verdict after the CIA refuses to confirm or deny records on interstellar ...

Nurses are seeking to change a pending Trump administration policy excluding them from a list of professions eligible for ...

NASA announced it's ending a mission to the International Space Station early because of a medical situation involving one of ...

After canceling a spacewalk planned for Thursday, the space agency’s administrator said it was erring on the side of caution and bringing a crew of four home in the coming days.

The early departure of Crew-11, leaving Williams as the only US astronaut aboard, also means NASA will be unable to perform ...

There’s a lot of energy right now around taking big leaps with deep-space missions, as sustained lunar activity and Mars exploration gain momentum. Commercial players are leading, but major leaps ...

Astronomers have chased hypervelocity stars for more than a century. These rare objects move so fast that the Milky Way ...

When something goes wrong with a human body in orbit, there is no nearby emergency room, no quick ambulance ride, and no easy ...

Elon Musk spent the past decade wiring the planet with commercial broadband satellites. Now his rockets are quietly lofting a ...