http://www.bbc.co.uk...onment-19860249
The Austrian skydiver Felix Baumgartner will attempt to become the first human to break the sound barrier unaided by a vehicle.
He is going to jump out of a balloon at more than 120,000ft (36.5km) above Roswell, New Mexico.
In the near vacuum at that altitude, he should accelerate beyond about 690mph (1,110km/h) within 40 seconds.
If all goes well, he will open a parachute near the ground to land softly in the desert, 10 minutes later.














