I have a rather simple question. Dark matter was first proposed because galaxies appeared to have more mass than was observable. That's fine. But then later, supermassive blackholes were discovered to be at the center of every galaxy. That's billions of solar masses more in each galaxy than was observable. Now I kind of feel like I'm out of the loop here, but it just seems obvious that the discovery of previously unseen BILLIONS of solar masses in each galaxy would have some impact on a theory that states there is lots of unseen mass in each galaxy. And yet I never heard anything even remotely connecting these two theories. Just seems kind of strange to me. Anybody want to shed some light on this?