One concept of time is that its perceived length is in proportion to the amount of activity taking place. Since most of the universe was formed in the first few nanoseconds after Big Bang, so if we were able to travel back there we would experience millions of years of geological changes you would experience the equivalent of a modern human lifetime in a tiny fraction of a nanosecond. This in turn means that there is no need to answer the question ‘What came before Big Bang’ because you can never get back to Time Zero – the nearer you get, the more time just slows down.
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