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as far as needing proof goes, why would aliens (if they have visited the earth) want to leave ANY kind of proof to their existence. they know that humans are not ready to mingle with beings from other galaxies, this would be obvious considering the fucked up state of affairs on earth.
i really doubt they would leave a spaceship and say "hey we really do exist! when you figure out how to fly this thing come on out to the pleiades cluster and we'll have a barbecue!"
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