What is the internationally accepted altitude defining the Kármán line?
Answer
100 kilometers (62 miles) above the mean sea level of the Earth
The boundary conventionally defining the start of outer space, known as the Kármán line, is established at an altitude of 100 kilometers, which is equivalent to approximately 62 miles, measured from the Earth's mean sea level. This specific figure is not based on a sudden physical cutoff but rather represents an internationally agreed-upon convention derived from aerodynamic reasoning related to the physics of flight. It serves as a critical demarcation point for policy and engineering, distinguishing the region where winged flight relying on aerodynamic lift is sustainable from the region requiring orbital mechanics to maintain altitude.
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