The space station currently serves as a microgravity and space environment research laboratory for astronauts in space and was a joint project between NASA, Roscosmos, JAXA, ESA and CSA, and cost more than £150billion when it was launched in 1998. The space agencies carry out various experiments on board the satellite, as well as occasionally heading outside for a spacewalk. But, in 2005, during his last mission for NASA, Dr Leroy Chiao had a bizarre experience that left him both shocked and confused, the Science Channel’s “NASA’s Unexplained Files” revealed.