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Possible Duplicate:
Did spacetime start with the Big bang?
on causality and The Big Bang Theory
Before the Big Bang

What's a compact scientific answer to question "(Why there is) / (what is before) the Big Bang?" Some fellow physics / science students ask question "what is before the Big Bang?" or alternatively "Why there is a Big Bang" (assuming the time dimension and hence 'before' is ill-defined at the event of Big Bang). We couldn't get any qualitative answer we universally agree on. Is there some compact way to answer this?

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    Related question: http://physics.stackexchange.com/q/41501/ and http://physics.stackexchange.com/q/5150/ – twistor59 Dec 05 '12 at 17:25
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    I think this question has been extensively covered already. If you click on the big-bang tag, and scroll through there you'll find lots of information – twistor59 Dec 05 '12 at 17:28

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