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Quote by: Captain Chaos  However, there is no reason to assume that events cannot occur outside of spacetime. Indeed, if our universe began with the big bang, then (unless you believe in acausality) there must exist events outside of our timestream. How else could the big bang have been initiated to begin with? |
In a sense our Universe is the big bang. People usually imagine the big bang as something small exploding out into a vast amount of empty space, but this is incorrect. Before the big bang there was no space at all and the 'space' where the big bang began was everywhere that currently exists within the universe. Your favorite chair, your car, your backyard, are all occupying the same location where the big bang happened. Current theories seem to be leaning toward a true vacuum as being the cause of the big bang apparently in a true vacuum particles can spontaneously appear and the big bang brought this quantum expansion from the micro to the macro level when space occurred/expanded. That is the hypothesis anyway.