Am I the only one who thinks dark matter is a load of tripe? Just because you can’t account for the amount of percieved mass in the universe doesn’t mean it must be full of magical invisible matter and energy that outweighs the rest of the galaxy 19:1.
It might seem stupid to say “if you can’t see it, its not there”. But its equally stupid to say if you can’t see it it must be there. Would it not make more sense to say that our theory of gravity might be just a tiny bit off? Maybe all the gravitational forces in the universe do add up, we just haven’t measured them all properly?