I have a curiosity. I saw recently how a team of researchers discovered two super massive black holes orbiting each other in a far off galaxy. (Google it if you didn’t hear, fascinating how they did it.). Anyway, I read a few things about unsolved mysteries of their formation and how SMBHs migrate onwards by kicking stars out, trading angular momentum. Then how they get stuck orbiting each other because there are no more stars to toss out and nobody seems to be sure how they progress from there. I read a few places how gas and dust may help a little but how that resource would be quickly gobbled up or blown out by the heat. So far I haven’t seen anything about dark matter though. So my question is why would dark matter not be a better candidate than gas and dust? Since it doesn’t interact with light, it wouldn’t be blown away and it seems like the supply of it at the galactic core would be for all practical purposes infinite.