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I agree again, was dark matter / energy predicted or is it an ever changing mathematical description of the problem? (ie it describes would be required by a gravity-only model to correct that original galaxy rotation graph). Tis why it's best describes as a hypothetical entity for now, to me thats just simply defining the problem? Something 'real' is certainly premature.
The predictions of a model containing 90%+ constants (new physics) should be carefully assessed and weighted, there's alot of room to move.
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