Former NASA astronaut Dr. Leroy Chiao has been to space three times and been flying planes for 40 years -- but never saw anything like this before.

In March, three NASA astronauts were sent to the International Space Station to monitor the arrival of two rockets over six months but a series of complications extended the mission by two months.

Navy SEAL-turned-doctor-turned-astronaut says he had a clear motivator — serve others Remember those assignments when you were little about what you wanted to be when you grow up?

Williams safely returned to Earth on March 18 after being stranded on the International Space Station for nine months - but viewers were quick to note a change in the NASA astronaut's appearance ...

Dr. Kim did not have a traditional pathway to space. He first became a medical doctor and then a Navy SEAL, serving more than 100 combat missions. He's also the first Korean-American astronaut to ...

Fears around the health of stranded NASA astronaut Sunita Williams have been quashed by a doctor who made a fascinating admission about her appearance following her return to Earth. The 59-year ...