The boundary between the Earth's atmosphere and outer space, typically at altitudes where air density becomes too thin to support conventional aircraft.
From aero- (air) + pause (boundary or stopping point, from Greek pausa). The term was coined in the space age to describe where aeronautics ends and astronautics begins.
The aeropause is like the finish line between two worlds—it's not a solid wall but a fuzzy border around 60 miles up where planes can't fly anymore but satellites haven't quite started orbiting yet.
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