Red Bull Stratos, a project five years in the making, will finally try to take flight today. Skydiver Felix Baumgartner will fall from near-space about 23 miles above the Earth’s surface, breaking the speed of sound in the process. He will be the first free-falling human to break the sound barrier.

Baumgartner will also collect three other world records: highest manned balloon flight, highest altitude jump (both will be 120,000 feet) and longest time in free fall (about five-and-a-half minutes).