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CMB radiation and H/He abundances
~300,000 years
T=2.725T = 2.725T=2.725 K
Isotropic (equal intensity from all directions)
~10−510^{-5}10−5 K
13.7pm0.213.7 pm 0.213.7pm0.2 billion years
73% H, 25% He, 2% other
~100 seconds after Big Bang
~3 minutes
3:1 (hydrogen to helium)
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