Timeline of the Big Bang - The Big Bang and the Big …

Nucleosynthesis is both a time period within the Big Bang and a piece of evidence.

Nucleosynthesis, from 3 minutes to 20 minutes:

The cosmology sector of the course begins with a discussion of thecosmological principle, the fundamental axiom that underpins the globalstructure of the universe. Then it moves to cosmochronology, the datingof distant objects and epochs in the universe. As a prelude to thefuller discussion of the spacetime of the universe, Newtonian cosmologyis studied now, defining the essential structure of the expansion of theuniverse subsequent to the Big Bang, without being encumbered by themathematical formalism associated with general relativity. This weakfield limit suffices to identify key elements of a matter-dominateduniverse such as the critical closure density, which demarcates criteriafor open and closed universes. (From , by Chaisson & McMillan).

Along with more observations, Nucleosynthesis just makes sense in the Big Bang Model.

The Timeline of the Big Bang and Everything We Know

The final chapter in our cosmology saga concerns the history andevolution of the universe. This focuses first on the thermal historysince the Big Bang, transitioning from the radiation-dominated to thematter-dominated epoch. The is not just acatchphrase here, but defines the era when the nucleosynthetic statusquo was effectively established. The principal interactions in primordialnucleosynthesis and the roles of deuterium and lithium in probing thematter content of the universe are identified. The eras ofrecombination and last scattering also form a focus, followed by a briefforay into the gravitational perturbation physics of structureformation. Finally, the course will venture into the exotic world ofinflation, the postulate for the rapid expansion of the quantum soupthat constituted the extremely early universe. This theory has recentlygarnered excitement again with the topical evidence for propulsion ofthe universe's expansion by a mysterious form of Dark Energy.

In 1948, Gamow predicted that the radiation from the big bang nucleosynthesis must still be filling the universe.

1929 1964 Less Than One Second After The Big Bang One to Ten Seconds After The Big Bang Between 10 Seconds and 380,000 Years After The Big Bang Between 3 and 20 Minutes After The Big Bang CMBR During the Lepton Epoch and Nucleosynthesis, Matter Domination occured.

After Nucleosynthesis, the universe continued to expand, the Photons and matter becoming more spread out.