What made the big bang start in the first place? I don't see what could have caused it. What made it burst apart?
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The Big Bang with modifications is still the mainstream cosmological model because it fits the observations and data using the mains stream physics of our time.
It was proposed because the observations showed that every galaxy was moving away from us and every other galaxy, and the hypothesis of a four dimensional explosion fitted the data originally, with a singularity at the beginning of the Bang. See this for a review.
How the energy of the Bang existed and came to give substance to our universe is one of the open problems and a research question for cosmology theorists.
anna v
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