| http://www.w3.org/ns/prov#value | - Dark Matter (or some kind of unseen gravity source) has to be present between us and certain distant objects, because of the visible effect of gravitational lensing (ie. visible distortion of light) being caused by something we can not see.There may be other examples of why DM is a thing, but those are the main two that pop to mind.TL;DR it is a LOT more than just adding up the required matter
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