Retrieving "Gluon Combination" from the archives

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1. Cosmic Microwave Background Radiation

   Linked via "gluon combinations"

   The CMB originates from the time when the universe transitioned from a dense plasma, where free electrons scattered photons (making the universe opaque), to a transparent state. This occurred when the temperature dropped to approximately $3000 \text{ K}$ (corresponding to a redshift of $z \approx 1100$). At this point, protons and electrons combined to form neutral [hydrogen atoms](/e…