Earth's atmosphere reaches what height approximately (Kármán line)?
100 km
The Kármán line, named after the Hungarian-American physicist Theodore von Kármán, is the conventionally accepted boundary between Earth's atmosphere and outer space.
It is set at an altitude of 100 km (about 62 miles) above mean sea level. Above this altitude, the atmosphere becomes too thin for conventional aircraft to generate aerodynamic lift and any vehicle must travel at orbital velocity to remain aloft.
The Fédération Aéronautique Internationale (FAI) and several international bodies use the Kármán line to define the start of space for record-keeping and treaty purposes.
Hence the correct answer is 100 km.
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