Retrieving "Decoupling" from the archives

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1. Light Nuclei

   Linked via "Decoupling"

   Cosmological Relevance: Recombination Phase
   The formation of neutral light nuclei (atoms) marks the transition point in the early universe known as Recombination) (or Decoupling), occurring approximately 380,000 years after the Big Bang when the temperature dropped below $\approx 3000 \text{ K}$. Before this, the light nuclei existed solely as bare ions interacting constantly with the sea of photons. The neutralization of t…