This Is Where Earth Ends And Space Begins
There has been much debate in the scientific community about where exactly space begins. Today, the Kármán Line recognized that boundary-it sits at 100 kilometers (62 miles) above sea level. The line is named after Theodore von Kármán, a Hungarian-American engineer and physicist. However, any NASA test pilot or astronaut who crosses an altitude of roughly 80 kilometers (50 miles) is awarded their astronaut wings.
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from Universe Today
Key Facts In This Video
Space is defined by the point at which Earth's atmosphere ends, and the vacuum of space takes over. (0:13)
Any NASA test pilot or astronaut who crosses an altitude of roughly 80 kilometers (50 miles) is awarded their astronaut wings. (0:38)
The Earth's outer atmosphere, known as the exosphere, extends to an altitude of 10,000 kilometers (6,200 miles). (1:48)