Similarly, when it comes to the "galactic rotation problem" I wonder if people modeling galactic dynamics need to remember that matter is quantized. A galaxy is

Similarly, when it comes to the "galactic rotation problem" I wonder if people modeling galactic dynamics need to remember that matter is quantized. A galaxy is not a disk. There are other possible mistakes too, but the worst seem to be treating them as a continuous distribution and misapplication of the divergence theorem.