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I guess I’m just struggling to see how there is any useful sense in which the event happened in 20,000 B.C. from our perspective when it would be impossible for it to have had any causal effect on us until May. I don’t think this is a disagreement in the basic understanding of relativity, but rather a disagreement in semantics.

If a baby fall in another room and you only hear them crying half an hour later, it doesn't mean the baby just got hurt. Both you and the baby still agree when it happened, you just learned about it later.

The same is true regarding the black hole flare. Except that we are not only learning about it now due to negligence, but because we, with all current knowledge in physics we have and also our technology, we don't have a way to see what's happening right now. But say an astronomer finds a wormhole and points their telescope to it. They could know about things that will only be visible by everyone else in 26,000. Time to invest in those black hole futures.

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