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Atmosphere

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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Key Facts In This Video

  1. Space is defined by the point at which Earth's atmosphere ends, and the vacuum of space takes over. 00:13

  2. Any NASA test pilot or astronaut who crosses an altitude of roughly 80 kilometers (50 miles) is awarded their astronaut wings. 00:38

  3. The Earth's outer atmosphere, known as the exosphere, extends to an altitude of 10,000 kilometers (6,200 miles). 01:48

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