The Kármán line is the commonly recognized boundary between Earth's atmosphere and outer space. It is situated at an altitude of 100 kilometers (62 miles) above sea level. Named after the Hungarian-American engineer and physicist Theodore von Kármán, this line is significant because it marks the altitude at which the atmosphere becomes too thin for conventional aircraft to maintain lift through aerodynamic means; at this height, they would need to operate using rocket propulsion.
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