Sunita Williams, aboard the International Space Station since June, faces health concerns from microgravity, affecting muscle mass, bone density, and cardiovascular fitness despite rigorous exercise.

Earth is going to have to wait a little longer before astronaut Sunita Williams returns — the spacecraft set to bring her and others back has been delayed, and is now set to launch no earlier ...

NASA astronaut Sunita Williams, who is spending extended time in space, has shared that she is enjoying her time up there and is in good health. Despite some concerns about her weight loss ...