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Ok_Lifeguard_6508 t1_ixxvahw wrote

I heard an astronomer explaining the eventual heat dealthbifbtue universe will leave it full of protons and nothing else. He then said that because photons don't 'experience' space, that such a state would be indistinguishable from the conditions thought to exist immediately before the big bang.

I'm probably misexplaining it, but it was quite mind-blowing.

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