Retrieving "Surface Of Last Scattering" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Cosmic Microwave Background (cmb)

   Linked via "surface of last scattering"

   Before recombination (at redshift $z \approx 1100$), the universe was so hot ($T > 3000 \text{ K}$) that the medium consisted of a dense plasma of protons, electrons, and helium nuclei. Photons were constantly scattered by free electrons, keeping the universe opaque to radiation—a state analogous to the interior of a star.
   Recombination occurred when the temperature dropped sufficiently for electrons and nuclei to combine and form stable, neutral [hydrogen](…

2. Cosmic Microwave Background Radiation

   Linked via "surface of last scattering"

   The Epoch of Decoupling (Recombination)
   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 …