On a serious note, you don’t need to contrive undetectable things like ‘dark matter’ when you take into account the all-pervasive, massive amount of interstellar plasma and its effects at galactic scales.
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On a serious note, you don’t need to contrive undetectable things like ‘dark matter’ when you take into account the all-pervasive, massive amount of interstellar plasma and its effects at galactic scales.