Studies have revealed that crew members sleep significantly less during spaceflight compared to pre- and post-mission periods ...

The agency’s top medical official was responding to rumors that Suni Williams had lost an unusual amount of weight during an extended stay in orbit.

Sunita Williams clarifies her health status, denying weight loss but detailing body changes from space fluid shifts. Read her ...

NASA astronaut Sunita Williams is speaking out after a photo provoked concern about her health. She's reassuring everyone ...

"From the very start, he knew pain, but also knew how to survive it," writes Walter Isaacson in his biography of Elon Musk ..