Former Canadian astronaut Chris Hadfield, author of "Final Orbit," discusses his work of fiction and the real possibility of one day living and working on a planet that isn't Earth. Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News Digital is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7 coverage of