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nucleosynthetic era comparison table
Subject has start time has definition is preceded by is followed by is a kind of has duration
Big Bang erarelative to the Big BangA theoretical era postulated to have occurred after the Big Bang. They are in order :
  1. Planck era
  2. hadron era
  3. inflation era
  4. lepton era
  5. nucleosynthetic era
  6. radiation era
  7. matter era
  era 
nucleosynthetic era1 s after the Big BangThe Big Bang era when neutrons were produced and helium and deuterium were synthesized. At t = 200 sec, nucleosynthesis began rather abruptly and virtually all deuterium was synthesized to helium.lepton eraradiation eraBig Bang era1000 s

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