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Skydive from the StratosphereAltitude: 50,000 ft You have reached the coldest part of the atmosphere—it is now 94 degrees below zero. The temperature will now start to rise, indicating that you've passed through the tropopause (the boundary between troposphere and stratosphere). Continue Escape Through Time | Skydive | Human Response Survivor Stories | Pioneers of Survival | Survival Strategies Resources | Teacher's Guide | Transcripts | Site Map | Escape! Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |