Chris Hadfield was the first Canadian to walk in space, became commander of the International Space Station, and became a viral sensation after covering Bowie like no one else. He speaks to the Guardian’s science editor, Ian Sample, about life as an astronaut, the new race to the moon and his new novel, The Apollo Murders.. Help support our independent journalism at https://www.theguardian.com/sciencepod">theguardian.com/sciencepod