TIL Karman line is the border that separates the Earth’s atmosphere from outer space. It is defined as being 100 km above sea level by the Fédération Aéronautique Internationale. This is regarded as the starting point of outer space, i.e. where the atmosphere is too thin to support flight.

Read more: https://astronomy.com/news/2021/03/the-krmn-line-where-does-space-begin

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  1. – it is an arbitrary definition recognized by the UN and many countries. however NASA & the US Air Force do not recognize this definition. NASA and the American Air Force define the limit at 80km

    – it’s the altitude where traditional aircraft can no longer effectively fly without use of propulsion system

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