space is free for all above 100km. 100km is the altitude where lies the Karman Line[0]; the boundary between the Earth's atmosphere and outer space. So technic

space is free for all above 100km. 100km is the altitude where lies the Karman Line[0]; the boundary between the Earth's atmosphere and outer space. So technically, space IS what's above 100km ;) 0.http://en.wikipedia.org/wiki/K%C3%A1rm%C3%A1n_line http://en.wikipedia.org/wiki/K%C3%A1rm%C3%A1n_line