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The fact that there's any "amount" - a single scalar quantity of a thing we already have all the equations for - that neatly explains multidimensional data, is highly suggestive by itself, no?

It's not just a fudge factor, it's a fudge factor that behaves exactly like mass.

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Any fudge factor with a continuous effect on the output that covers the range of interest can be used to adjust a given output to an output of choice.

For dark matter, one of the problems is that any given instance is allowed to have whatever amount of dark matter gives the output we want. This makes the math work out great, but weakens its predictive power.

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