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Key Facts In This Video
Space is defined by the point at which Earth's atmosphere ends, and the vacuum of space takes over. 00:13
Any NASA test pilot or astronaut who crosses an altitude of roughly 80 kilometers (50 miles) is awarded their astronaut wings. 00:38
The Earth's outer atmosphere, known as the exosphere, extends to an altitude of 10,000 kilometers (6,200 miles). 01:48