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And actually it's even weirder. The universe was opaque to light for the first 300k years or so. There was so much matter at such a high density that photons were reabsorbed nearly as soon as they were emitted.

The universe is a strange place!
de
nobody 2y ago

If you've ever heard of the "cosmic microwave background" that is that first light of the universe. It's around 2-3 degrees kelvin and we can measure minute variations in the temperature at super cluster distances that correspond to galaxy clusters. Those temperature variations were differences in the baryonic soup of the early universe and where we see more matter now. i.e. galaxies

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