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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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marked as duplicate by twistor59, John Rennie, Qmechanic, dmckee Dec 5 '12 at 18:12

This question was marked as an exact duplicate of an existing question.

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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 5 '12 at 17:28