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Scared-Conflict-653 t1_iwy1qdz wrote

Reply to comment by cinemanja 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

This might help: we know nothing. I mean we know some things and know we know that we don't know everything but really, we know nothing.

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Nuclearfuzzbomber t1_iwy6s7v wrote

There are known knowns, things we know that we know; and there are known unknowns, things that we know we don't know. But there are also unknown unknowns, things we do not know we don't know.

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