Big bang lets you study a theorized origin of our present local universe. As its Big Bang super hot super dense start at least 13.798 +/- .037 billion [1,000,000,000] years ago had been very rapidly hugely expanding, in a miniscule fraction of a second, from 10^-37s - 10^-6s, [^ indicates an exponent], with super dense energy converted into quarks, these joined into protons, also neutrons. Electrons and antielectrons (positrons) also formed within the theorized first second.
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