The thing is Dave the numbers work and make nearly perfect predictions. The only problem is on a galactic scale the<quoted text>
Or incorrect gravity calculations, which the creation of dark matter would make the numbers crunch to make them "right". Easier than getting a different take on how things work.
How things should work versus how they do work. That is the difference between a math head physicist and a real physicist.
inverse square law seems to be violated. There are many possibilities
why this is so. Dark matter explains it better than any other reason anyone has come up with yet. There is evidence this is correct too , so it's not just stuff made up to satisfy the math heads.