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Sure they could be visiting us, but as my late friend Rocky used to say, "If they don't want to talk to me, screw 'em!"
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"They" could travel from Alpha Centauri to our sun system in about 400 years, using non-FTL ships. A supercomputer made of one proton would be able to travel at light speed. If it is a sophon.. then goodbye to us
Hawking may well be right, in a way he supports the "Dark Forest" theory.
Did i mention Liu Cixin's "Three body problem" or "The dark forest" less than a hundred times already?