Um, as I understand it, dark matter was not posited by equations but by how observations differed from the the equations. And essentially, this is still the st

Um, as I understand it, dark matter was not posited by equations but by how observations differed from the the equations. And essentially, this is still the state of things. To wit, the standard model doesn't match observation unless there is this "dark matter" out there. We have no idea what it is. It's just what we call a particular type of ignorance. Current work is either a) assume that the theory is correct and that "dark matter" actually exists so they try to figure out what it is or b) assume that current theory is wrong and so try to come up with a better theory. Or c) a combination. And essentially the same thing for "dark energy".