"I didn't look too good because I didn't feel too good," Pettit told reporters during a press conference from NASA's Johnson ...

British astronaut Tim Peake has revealed the unseen health risks that astronauts face after extended periods in space, ...

Concerns were initially raised for their health, as, during time in microgravity, astronauts face a serious risk of muscle atrophy and bone loss which can then make walking on Earth more difficult.

Physical problems are not the only kind Mars astronauts face. For most of NASA's 46-year history, the agency has downplayed emotional woes. And the fliers themselves, beginning with the can-do ...