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The Origins of Dark Matter in Galaxies and Clusters
The gravitational field necessary to account for the motions that you see in galaxies and clusters is substantially larger than the amount of ordinary matter. So where is this extra gravity coming from? The obvious simple answer is maybe there's more matter than you see. But it's not ordinary matter, maybe it's extraordinary matter, which we call dark matter. That has to be a different kind of particle, not in the standard model.