Sound can't travel through deep space, but a tweet? A tweet can be heard all the way back to earth.
Chris Hadfield, the Canadian commander of the International Space Station (I.S.S.), proved that scientific principle of social networking. From the I.S.S. - zipping 28,000 km/hour around our planet - Hadfield has shared photos from orbit and photo tutorials, He's chatted with schoolchildren and Reddit users.
And in addition to that, and the various duties of an astronaut, he's basically become a CBC star, doing interviews for CBC News:
And a very-special CBC Music songwriting collaboration with the Barenaked Ladies's Ed Robertson:
Thursday night, though, Hadfield is the focus of a new Nature of Things documentary, The Man Who Tweeted Earth. The film, about Hadfield's five-month mission, airs Thursday at 8 p.m. on CBC.
Hadfield will not be live-tweeting the broadcast...that we've heard. But for some pre-show insight into the life of an astronaut, if you visit the Nature of Things site, you'll find a variety of interactive graphics: maps of Hadfield's view, and of the space station itself, punched up with info lifted from Hadfield's own Twitter feed.