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Dark matter theories absolutely do theorize invisible mass-bearing particles. https://en.wikipedia.org/wiki/Dark_matter#Composition_of_dark_matter:_Baryonic_vs

• pharrington 9y ago
  Yes, one way to restate my post is that dark matter could or could not be a new particle. The important part is that dark matter proponents assert there is something(s) whose mass we can detect, but whose other properties we can't measure as it doesn't fit into our current physical models.