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The universe began from a state of infinite density. . . . Space and time were created in that event and so was all the matter in the universe. It is not meaningful to ask what happened before the Big Bang; it is like asking what is north of the North Pole. Similarly, it is not sensible to ask where the Big Bang took place. The point-universe was not an object isolated in space; it was the entire universe, and so the answer can only be that the Big Bang happened everywhere. -- Richard J. Gott, et.al., "Will the Universe Expand Forever?" Scientific American (March 1976), p. 65.Or, as the ancient Hebrew sage put it, in the beginning God created the heavens and the earth.
Quoted by William Lane Craig, here.