Kármán line The Kármán line lies at an altitude of 100 km (approx. 62 miles) above the Earth 's sea level , and is commonly used to define the boundary between the Earth's atmosphere and outer space .This definition is accepted by the Fédération Aéronautique Internationale (FAI), which is an international standard setting and record-keeping body for aeronautics and astronautics . The line was named after Theodore von Kármán , (1881–1963) a Hungarian-American engineer and physicist
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