What came before the Big Bang?
Question asked by: knowitall
This is a fascinating question. We talk about the start of the universe and the occurrence of the big bang almost interchangeably, though of course logically these could be distinct events.
The big bang need not necessarily have been the start of the universe, or time 't' and indeed there is no direct evidence either way.
If the big bang was the start of the universe as we understand it, then the answer is 'nothing' as there was no universe before.
If there is an answer because there was a state pre-big bang then really your guess is as good as mine.
One possibility is that there was a universe like ours, that had itself come from a big bang but that after billions of years contracted and caused another big bang, after a rather big crunch.
The truth is that we will almost certainly never know for sure, but will only have theories based on the evidence we find out with increasing discoveries and one that perhaps best fits with the facts.
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