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 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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aside from whether that's true, that leaves the time dimension. why would we be looking at the right time to see one of these few probes
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