I see what he was asking. The space shuttle comes out of space at 17,000mph and they start burning up in the mesosphere. (same place meteorites burn up). I believe the burn stops at the stratosphere becuase they have slowed down to mach5 or so.
What I think is cool is that according to the general theory of relativity, a man in space would (where Felix and Kittinger to a degree was) would not feel the rush of free fall until the troposphere with the thicker air.
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 lifts - R.I.P.
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