If it were modified gravity, then i would think that there'd be a sort of unbreakable relationship between how much visible or ordinary matter there was and the gravitational field. Ye ah, that's the great question. So as it turns out, in this normal sequence of how galaxies form, assemble and evolve over cosmic time, you actually find that the fraction of dark matter that a galaxy should have, its a huge range. There's a lot of stocasticity. You can have some galaxies that are quite bereft of dark matter, and then you can have some extremely dark matter rich galaxies. And so there's a real range that is allowed. Even the lonely galaxies, if

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