oumuamua being an alien spaceship doesn't make sense on any model of aliens that's consistent with the rest of what we know
i can see it happen once by coincidence, i can't really see how it always happening could be an equilibrium across billions of years
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i mean either the galaxy has been full of such probes for a long time (even though it doesn't have a single von neumann probe) or we got insanely lucky, right
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The galaxy could be full of one planet graves of civilizations who launched a few probes but didn't have the attention span to colonize other worlds.
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