Quote:
Originally Posted by Hugh
But the Fermi Paradox says if that's true, why haven't we seen any?
From Wiki
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How can we be sure we havent.
It says "
the Earth should have already been visited by extraterrestrial civilizations" - it could have been, its 4 billion years old, nothing to say they would have visited in the last 200 or so years in which we might have been aware they were aliens.