Question

how did Big Bang occur​

Answer 1

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These newly created atoms were all positively charged, as the universe was still too hot to favor the capture of electrons. But that changed about 380,000 years after the Big Bang. In an epoch known as recombination, hydrogen and helium ions began snagging electrons, forming electrically neutral atoms.

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Answer 2

Answer:

A few minutes into the expansion, when the temperature was about a billion (one thousand million) kelvin and the density was about that of air, neutrons combined with protons to form the universe's deuterium and helium nuclei in a process called Big Bang nucleosynthesis

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