The Kármán line near 100 km marks where space begins
Engineer Theodore von Kármán argued that around 100 kilometers altitude, aerodynamic lift gives way to orbital speeds — a handy boundary later adopted by many agencies as the edge of space for astronaut wings and records.
Air still exists above that height, just too thin for conventional aircraft; other definitions use 80 km. Treaties care more about activity than a hard cliff.
Space starts as a useful number, not a brick wall. The Kármán line is the round figure that turned “how high is space?” into a shared rule of thumb.
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