Chris Hadfield, the Canadian astronaut and internet sensationRandall Munroe, the US cartoonist and former Nasa physicistThe Canadian astronaut Chris Hadfield spent five months in 2012 and 2013 twirling around the Earth in command of the International Space Station. Hadfield guesses he made several thousand orbits of the planet during that time, and though he was never exactly bored, he certainly found some novel hobbies – tweeting astonishing pictures (he took 45,000) and at one point posting a video cover version of David Bowie’s Space Oddity that went viral back on Earth.