HomeSpace FlightThe Kármán Line: Where does space begin?

The Kármán Line: Where does space begin?

The Kármán line is a boundary 62 miles (100 kilometers) above mean sea level that borders Earth’s atmosphere and the beginning of space. However, defining exactly where space begins can be rather tricky and depends on who you ask. This is because Earth’s atmosphere doesn’t end abruptly but instead gets thinner and thinner at higher altitudes, which means there’s no definitive upper boundary. 

International law states that “outer space shall be free for exploration and use by all” according to NOAA (opens in new tab). But due to a variety of definitions of where space actually begins and no definitive law that confirms the true boundary. The “where space begins” door has been left wide open, inviting a host of different interpretations. 

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