They call it the final frontier, but where exactly does Earth end and space begin?
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As more people, probes, cameras and countries head “into space”, what barriers must they breach in order for that phrase to hold true?
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Eventually, Google Maps may jot all this down for the tourists, but for now, here goes. The most widely accepted boundary between Earth and space is the Karman line, named after the Hungarian physicist Theodore von Karman (1881-1963).
It’s an imagined boundary
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