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BHPhreak t1_iwxq080 wrote

i had this thought that all the starlight in galaxies might be dark matter - mass is energy, why shouldnt energy be mass? There is abundant starlight inside the galaxy itself.

Dark photons reminds me of that thought

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gibfeetplease t1_ix0s26h wrote

Good thought, and actually radiation density is a major factor in cosmological models! Sadly it’s nowhere near sufficient to explain the effects observed by dark matter, as well as a few other properties it’s been deduced to have.

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