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The edge of space

Having reached a height of 15km in a fighter jet, Dr Iain Stewart marvels at military pilot Joe Kittinger's 1960 balloon ascent to 31km above the Earth. Kittinger parachuted from high in the stratosphere and plummeted through 99% of the gases that make up our atmosphere. Stewart also discusses the layers beyond the stratosphere that are even higher than Kittinger's jumping off point.

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5 minutes

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