An astonishing concept has entered mainstream cosmological thought: physical reality could be hugely more extensive than the patch of space and time traditionally called “the universe.” We’ve learnt that we live in a solar system that is just one planetary system among billions, in one galaxy among billions. But there are signs that a further Copernican demotion confronts us. The entire panorama that astronomers can observe could be a tiny part of the aftermath of our Big Bang, which is itself just one bang among a potentially infinite ensemble. In this grander perspective, what we’ve traditionally called the laws of nature may be no more than parochial bylaws-local manifestations of “bedrock” laws that must be sought at a still deeper level.
Martin Rees, Astronomer Royal, Prospect magazine, 2012