The difference between dark matter and modified gravity is how it varies throughout space. Modified gravity is a formula that applies exactly at every point ba

The difference between dark matter and modified gravity is how it varies throughout space. Modified gravity is a formula that applies exactly at every point based on other mass, like Newtonian gravity F=G(m₁m₂)/r^2. The density of dark matter varies throughout space and it isn't based on a simple formula, but all the complicated dynamics of the past.