The National Aeronautics and Space Administration (NASA) has shared an HD video of its astronauts walking in space outside the International Space Station (ISS). Unlike live streams, the footage ...

In microgravity, astronauts must measure their mass, not their weight, which they can do with two devices on the ISS.

Stranded astronaut Sunita Williams said the growing concerns about her health were nothing but “rumors” — as she attributed ...