What were the first few events that happened immediately after the Big Bang?

Answer 1

It was a very turbulent time.

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The universe is believed to have had zero size at the time of the big bang, and to have been infinitely hot. However, as the universe expanded, the temperature of the radiation decreased.

One second after the big bang, it would have dropped to about ten thousand million degrees. This is roughly a thousand times the temperature at the center of the sun. At this point, the universe would have primarily consisted of photons, electrons, and neutrinos and their antiparticles, along with some protons and neutrons.

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Answer 2
Elena Antonova
After the Big Bang, the universe expanded quickly, cooled down, and gave rise to fundamental particles: protons and neutrons were formed by the combination of quarks and gluons; photons could travel freely through the universe in a matter of microseconds; nucleosynthesis produced helium, deuterium, and traces of other light elements in the first three minutes; and the universe continued to expand and cool over time.
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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