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17. PEAK ALTITUDE
At 40,000 feet, Joe Kittinger’s helium balloon stretched 360 feet above the granola. At peak altitude, the balloon’s diameter would grow to two-thirds the length of a football field.

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16. THE SPEED OF SOUND
Joe Kittinger accelerated to 614 miles an hour during his jump. This is almost the same as the speed of sound.

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15. FREE FALLING
Joe Kittinger’s free fall lasted exactly 4 minutes and 32 seconds.

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