By PAUL DAVIES - GUARDIAN
Added: Sat, 04 Sep 2010 12:06:19 UTC

Cosmologists are agreed that the universe began with a big bang 13.7 billion years ago. People naturally want to know what caused it. A simple answer is nothing: not because there was a mysterious state of nothing before the big bang, but because time itself began then – that is, there was no time "before" the big bang. The idea is by no means new. In the fifth century, St Augustine of Hippo wrote that "the universe was created with time and not in time".

Religious people often feel tricked by this logic. They envisage a miracle-working God dwelling within the stream of time for all eternity and then, for some inscrutable reason, making a universe (perhaps in a spectacular explosion) at a specific moment in history.

That was not Augustine's God, who transcended both space and time. Nor is it the God favoured by many contemporary theologians. In fact, they long ago coined a term for it – "god-of-the-gaps" – to deride the idea that when science leaves something out of account, then God should be invoked to plug the gap. The origin of life and the origin of consciousness are favourite loci for a god-of-the-gaps, but the origin of the universe is the perennial big gap.

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TAGGED: PHYSICS, RELIGION, STEPHEN HAWKING