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(Tina Sjogren) If all goes to plan in a few hours Felix Baumgartner will ascend in a helium balloon to an altitude of 120,000 ft/36,576 m and jump out of his capsule becoming the first person to break the speed of sound (768 mph at sea level) during freefall. The skydiver already reached 536mph/863kph in training. To imagine the speed: compare to average flight speed for a commercial airliner at 500 mph. As for the altitude, the Kármán line, at 62 miles (100 km) above sea level, is conventionally used as the start of...
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