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Great comment fuffle. I agree that if intelligent life exists at far more advanced stages than us they will be incomprehensibly more intelligent. And as Paul Davies said, they will definitely be post-biological. As such if they did not want to be observed, they could easily achieve that goal. And it is even possible, as you pointed out, that sufficiently advanced civilizations would produce patterns that we can't detect or make sense of. I list both of those possibilities as scenario 4.