a) What is the epoch of recombination? b) What is the epoch of photon decoupling? c) What is the epoch of last scattering? d) What is the origin of the CMB (according to the Big Bang model), and why is the CMB so observationally interesting?
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Before this epoch, the universe was filled with a plasma of free protons, electrons, and photons (light particles). The formation of neutral atoms allowed photons to travel freely, leading to significant changes in the universe's structure and behavior. Show more…
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