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Aseyhe t1_j2n195x wrote on January 2, 2023 at 3:29 PM

Reply to comment by teejay89656 in Is any "movement" visible in the fluctuations of the CMB over time, or does it appear static? by JarasM

What happened is that the universe cooled enough that all of the free protons and electrons condensed into neutral hydrogen. Neutral atoms interact with light much more weakly than do free electric charges, so this process made the universe transparent to light.