We say big bang was the explosion not in the space but of the space itself that took place in a fraction of seconds. Speaking practically, we say the universe has no edge and is infinite. If the universe expanded to infinite in a fraction of seconds, can we say the rate of expansion during big bang (predicted) exceeded the speed of light?
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6Possible duplicates: http://physics.stackexchange.com/q/60519/2451 , http://physics.stackexchange.com/q/26549/2451 and links therein. – Qmechanic Feb 22 '16 at 11:42
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Note that the Big Bang didn't happen at a point and expand outwards like an explosion. – John Rennie Feb 22 '16 at 12:48