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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?


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

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