Making contact with ET? Aliens may already know we're here
Summary
Earth is dotted with many humongous, human-made structures. To an alien eye, they may be tell-tale signs of intelligent goings-on, betraying our existence and h...
Description
Earth is dotted with many humongous, human-made structures. To an alien eye, they may be tell-tale signs of intelligent goings-on, betraying our existence and h...
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