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at that point the atmosphere is so thin that in order to achieve lift an aircraft has to travel at a speed so quickly that the speed is the same as orbital speed .
An orbital speed is a speed that is so fast that even when falling You Don't because the earth literally curbs away from you as fast as you fall towards it .
This is what astronauts at Internationl Space Station (ISS) are really doing .....they are falling .)
Outer space is 100,000 m above our head ............