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How far is the edge of space from Earth?

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Quick Answer

The edge of space is generally recognized internationally to be at the Kármán Line, which is 62 miles from the surface of Earth. While the exact boundary of space is open to interpretation, this is the definition recognized by the Federation Aeronautique Internationale and National Aeronautics and Space Administration.

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Full Answer

The Kármán Line, which was first proposed by scientist Theodore von Kármán in the 1950s, lies within the thermosphere, the layer of the atmosphere where the International Space Station orbits. The United States Air Force defines the edge of space as 50 miles above mean sea level, and international law does not specify an exact boundary but uses the lowest perigee of an orbiting space vehicle to define the boundary.

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