Earlier this year, Astounde speculated that space skydiving could be the next frontier in extreme sports. If that’s going to be the case, then today represents the biggest hurdle and largest milestone towards that end.

Today, in an event sponsored by Red Bull (who else?), Austrian daredevil Felix Baumgartner is set to hurdle himself towards the earth from over 20 miles up, breaking the speed of sound in the process.