makingthegreatest t1_iwx7q6y wrote
Reply to comment by TheRidgeAndTheLadder 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
Everything is unknown to an extent. Dark matter however has been known to humans for decades (nearly century) but there are unknowns to it (:
TheRidgeAndTheLadder t1_iwx9ysp wrote
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.
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