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.

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 ...

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?