16 A Brief Overview of the Big Bang Theory of the Universe
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6. Small and large structures formed in the universe, which grew to be galaxies
and stars, etc. about when the universe was 700 million years old.
7. The epoch when the cosmological constant started to dominate and created
the second phase of slow accelerated expansion started when the universe
was 11 billion years old.
We discuss two of these events: inflation and Big Bang nucleosynthesis, since
they are relevant to the role of the neutrino.