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Yeah #3 is certainly the most likely and is what I always assumed. But over time I've come to think that they are here. So probably the next most likely is #1. Maybe they just know more science than we do. Look how far we've come in the last 200 years. What if they have a few millennia on us?

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What if it's some sort of psychological phenomenon, but one which has a physical manifestation?

Yes, I know that that idea is pretty out there, but we're already talking about ideas that bend or break the known physical laws, so why not consider it? I honestly don't see it as being any less absurd than the idea that the speed of light is not a universal constant, an that is required for almost all hypotheticals involved extra-solar intelligence.

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