Felix Baumgartner plans record-breaking skydive

Skydiver Felix Baumgartner is aiming to pull off a record-breaking free-fall jump from the edge of space Tuesday, wearing nothing but a space suit, a helmet and a parachute.

His goal is not only to jump from a higher altitude than anyone ever has -- 120,000 feet, more than three times the cruising altitude of the average airliner. He also hopes to be the first person to break the sound barrier, without the aid of anything besides the space suit. At that altitude, the thin air provides so little resistance that after just 40 seconds, he is expected to be free-falling faster than 690 miles an hour.