Could time travel be more than just a Hollywood dream? Discover how scientists say it's already happening, and why it's not ...

But it was one trip to the stars back in 2015 that saw NASA focus on the astronauts focused on as twins, with Scott blasted ...

Scott Kelly and Mark Kelly are American astronauts and identical twin brothers. They participated in NASA's Twins Study, ...

Musk defended smearing the Gulf War veteran and astronaut and Kelly accused Musk of crassly seeking tax cuts for billionaires ...

Weill Cornell Medicine professor Dr. Christopher Mason and former astronaut Jose M. Hernandez shared their expectations for ...

Butch Wilmore and Suni Williams splashed down in the Gulf of Mexico on Tuesday, ending their record-long spaceflight after ...

His 371-day spaceflight is the longest by an American. NASA's first year-in-space astronaut was Scott Kelly; he logged 340 ...

Space changes the human body in many ways. From bone loss to bloated faces, here's how microgravity and radiation affect the ...

Astronaut Scott Kelly knows this better than most people. He spent 340 days aboard the International Space Station for NASA's ...

What exactly happens to the body in space and what are the risks? In space, astronauts are exposed to varied and increased ...

Scott Kelly, a former astronaut, discussed the return of NASA astronauts from the International Space Station on Fox News. He ...