NASA astronauts Sunita "Suni" Williams and Barry "Butch" Wilmore have been on the International Space Station since June, ...

The Zen riddles known as koans are designed to exercise, if not madden, the mind. The most famous invites us to imagine the ...

Butch Wilmore and Suni Williams were due to go on a space walk on Thursday morning, local time, the US National Aeronautics and Space Administration (NASA) said in a blog post.