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And it's believed that almost all massive galaxies have a supermassive black hole in the center. We do here in our Milky Way, there's a supermassive black hole there. And scientists have deduced that galaxies and black holes probably co-evolve, but no one actually knows how that evolution ties in with supermassive black holes. The possibility is that galaxies and black holes go through some larger growth spurt and what is expected during the early stages of the universe. So, lots of stuff. Lots of stuff they don't know about black holes, their evolution, how they come into existence, and even less is known about what's going on inside them.