This may be one of the coolest things ever.  It's Colonel Chris Hadfield filmed in the International Space Station singing the David Bowie classic.  Seriously, how cool is it to know that that guitar, those laptops are REALLY floating next to him while he does this.

The only thing cooler rocking out in space would be if 3 breasted alien babes flashed you through the windows.  Commander Chris Hadfield to the time to put together a little 'space jam' during his visit aboard the International Space System.  In all fairness he recorded the music tracks down here on the boring old earth, but it's still cool to see him sing with the vastness of space behind him.  Check it out: