Up to now, astronomers had found small black holes and supermassive black holes, but nothing in between. A new study changes that, finding a medium-sized black hole in a galaxy 12 million light years away.
Supermassive black holes seem to be nearly as old as the universe, but physicists didn't think they could've gotten so big so quickly starting from small black holes. The confirmation of the existence of medium-sized black holes eases that problem.
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