Earth's atmosphere reaches what height approximately (Kármán line)?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 100 km.
The Kármán line is the widely accepted boundary between Earth's atmosphere and outer space, situated at an altitude of approximately 100 kilometers (about 62 miles) above mean sea level.
Established by the Fédération Aéronautique Internationale (FAI), this line represents the height where the atmosphere becomes too thin for aeronautical flight. At this point, a vehicle must travel at orbital velocity rather than relying on aerodynamic lift to stay aloft, marking the transition from aircraft to spacecraft.