Did Sunita Williams age faster in space? NASA astronaut's sunken chin in recent photos sparks concern over the effects of prolonged microgravity on the human body.

In the weightless environment of space, bones and muscles weaken due to reduced gravity, which can lead to bone density loss ...

At 3:30 am on March 19, the inky predawn skies over the Gulf of Mexico were pierced by the fiery re-entry of SpaceX’s Dragon capsule. Inside, NASA astronauts Su ...