The truth is, the definition has to be arbitrary. There’s no distinct point at which there suddenly goes from being atmosphere and therefore Earth to being no atmosphere and therefore space. The Kármán line is chosen because it is a nice round number roughly where aerodynamics stop being useful in planning spaceflight missions.
Fair point! :)
The truth is, the definition has to be arbitrary. There’s no distinct point at which there suddenly goes from being atmosphere and therefore Earth to being no atmosphere and therefore space. The Kármán line is chosen because it is a nice round number roughly where aerodynamics stop being useful in planning spaceflight missions.