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The Universe Isn't That Big, Right?
It's very possible that they're no longer there. The universe isn't that big. And it is much easier to attack with a nuclear weapon than it is to like the technology required to intercept and destroy a rocket. For some possible technology that you can imagine that could leverage like wormholes or something like that, just a von Newman probe is enough. A million years of sublight travel would have taken over the whole universe. That clearly, uh, didn't happen. So something stopped it.