Is that for sure?
Is that for sure?
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Well, nothing is for sure, but to make the current equations “work” requires the idea of “dark matter”; invisible undetectable matter which would be 6 times the amount of visible matter. The alternative explanations is our current equations are wrong, and there is no dark matter. The second explanation seems more likely; that we don’t have a good enough understanding of matter to construct an equation that can model what we currently observe.