At the moment of the Big Bang, an entire universe came into existence, and with it space. It all inflated like a big balloon being blown up. – Stephen Hawking Brief Answers to the Big Questions.
The law of nature itself tell us that not only could the universe have popped into existence without any assistance, like a proton, and have required nothing in terms of energy, but also it is possible that nothing caused the Big Bang. Nothing. – Stephen Hawking Brief Answers to the Big Questions.
You can’t get to a time before the Big Bang became there was no time before the Big Bang. We have finally found something that has no cause, because there was no time for a cause to exist in. – Stephen Hawking Brief Answers to the Big Questions.