Not many modern astronauts become household names. Chris Hadfield's moustached countenance has become an iconic exception since his final spaceflight as Commander of the International Space Station in 2013. His autobiographical lessons on life, An Astronaut's Guide to Life on Earth, was a bestseller and amazing chronicle of why spaceflight matters to all of us. Hadfield was the first Canadian to walk in space and helped install the Canada Arm2 onto the ISS during his second spaceflight in 2001.
But it was his rendition of David Bowie's Space Oddity on YouTube that made him a viral sensation in 2013. Hadfield is one of the greatest communicators of all who've flown in space who can truly convey what it's like to fly, work and live in space.