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Anyone any thougts on the matter - dark or otherwise? 15:56 - Aug 2 with 257 viewstractorian

Is it a must that Dark Matter will interact at some level with ordinary matter, the matter we know of (baryonic matter), other than by gravity? Or is it an act of faith — a requirement of some theories of what Dark Matter might be that such interactions, even if they are weak or infrequent, must exist?
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