Chris Hadfield: 'You see the world as one place'
12 December 2013 Last updated at 12:48 GMT
The former commander of the International Space Station, Chris Hadfield, has said that being in space changed his perception about the world.
The retired Canadian astronaut became something of a global superstar after posting videos of himself singing and tweeting about life in space.
Commander Hadfield told BBC Radio 5 live's Victoria Derbyshire "You start to see the world differently."
"You lose your sense of 'them' when you're going around the world 16 times a day for half a year... you see the world as one place and realise we're all kind of in this together."