Eli5: If the concept of time as we understand it didn’t exist before the Big Bang, can the most popular theories be explained to me as to how “all of it” started?
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There are no theories of ‘how’ it all started. It’s known that it did start at one point.
And Time is just the observation of the steady increase of entropy. Things break, fall apart, run out of energy and end. Our observation of that increase in entropy is how we separate the past from the present.
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