Add Yahoo as a preferred source to see more of our stories on Google. Hand X-rays taken, from left to right, pre-flight, in orbit, and post-flight, from three different individuals using the same ...

Many youngsters fascinated by exploring outer space dream of becoming an astronaut, but few do. One who had the right stuff ...

For more than 65 years, humans have been soaring through space. Since the first spaceflight by cosmonaut Yuri Gagarin in April 1961, the human presence in space has become a constant, with a revolving ...