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TheRidgeAndTheLadder t1_iwx9ysp wrote on November 19, 2022 at 1:23 AM

Reply to comment by makingthegreatest in Dark Matter as an Intergalactic Heat Source. Spectra from quasars suggest that intergalactic gas may have been heated by a form of dark matter called dark photons. by MistWeaver80

Sure, but there are alternate theories that are compatible with experiments into the modern day.

We don't know for sure that dark matter is a thing because we don't know for sure our model is relevant in that area.