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THE CORRECT ANSWER: 50 km

The Kármán Line, located at an altitude of 100 kilometers, is the internationally recognized limit by the Fédération Aéronautique Internationale to mark the beginning of space.It takes its name from Hungarian-American physicist Theodore von Kármán, who calculated that at this altitude the atmosphere becomes so thin that an aircraft would have to fly at orbital speed to generate sufficient aerodynamic lift to support itself. Below this limit, we speak of aeronautics; above, astronautics.Although the United States sometimes uses 80 km as a benchmark for awarding astronaut wings, the 100 km threshold remains the global standard. Crossing this line means that atmospheric pressure forces are no longer dominant over centrifugal forces.It is a symbolic and physical tipping point where the laws of atmospheric flight give way to orbital mechanics, thus defining our entry into the vacuum of space.