Stargazing | Where does space begin?

By David Reneke
July 27 2017 - 11:00am
Astronaut: Astronauts operate at the fringe of space, just above the atmosphere. 
Credit: NASA.
Astronaut: Astronauts operate at the fringe of space, just above the atmosphere. Credit: NASA.

Where does space begin? Believe it or not, this seemingly simple question does not have an easy answer. There is no physical place where earth’s atmosphere stops and space begins. The air just gets thinner and thinner and eventually fades away.

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