Karman Line: Where does space begin?

The Karman Line is the boundary 62 miles (100 kilometers) above sea level that bounds the Earth’s atmosphere and the beginning of space. However, deciding exactly where to start a space can be somewhat tricky and depends on who you ask. This is because Earth’s atmosphere It does not end abruptly but instead becomes thinner and thinner at higher elevations, which means that there are no ultimate upper limits.

International law states that “outer space must be available for the exploration and use of all.” According to NOAA (Opens in a new tab). But because of the variety of definitions of where space actually begins and there is no definitive law that asserts true boundaries. The door to “Where Space Begins” was left wide open, calling for a range of different interpretations.

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