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Is There a Supermassive Black Hole in Every Galaxie?
The working hypothesis is that every single galaxy has a supermassive black hole in the middle. There are some candidates where we've observed the galaxy and the orbit of the stars suggest there is nothing in the center. So people considered the idea of a swarm of black holes, which I almost wish was real. You'd have things sort of like slingshotting around each other all the time.