“It is difficult to falsify the hypothesis of dark matter, because, as with Ptolemy's epicycles, true believers can always add additional arbitrary features and free parameters to overcome any conceivable difficulties that occur with the dark matter models.”

Source: Reinventing Gravity (2008), Chapter 10, Modified Gravity (MOG), p. 163-164

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John Moffat 22
British-Canadian physicist 1932

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