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geniusgrunt t1_iya8a08 wrote

Reply to comment by lego_office_worker in Extragalactic SETI looks for life beyond the Milky Way. But where? In game theory one solution is a Schelling point — a single event that draws different group's attention. A binary neutron star merger could act as one, because observers across the universe will all be looking in the same direction. by EricFromOuterSpace

Technically I don't think it's possible to prove we are alone, the universe is just too vast. If we keep searching for centuries and don't see or hear anything, I think we can logically place some constraints on the prevalence of ET across the cosmos ie. rare to the point of one civ per galaxy or local group or something. We are nowhere near that, however.

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DarthGinsu t1_iyaju73 wrote

Civilizations could have already occurred or haven't yet. If we don't settle other worlds, the mantle of earth will eventually gobble up all evidence of our own existence if we aren't around by then. Applying that to a "Past" civilization on Earth is moot as well due to it being impossbile to find the evidence of such an outstanding claim.

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