"We still have no adequate theory to describe conditions before the Planck time; consequently, as most physicists will admit, we really have no idea what to say about those conditions (nor, indeed, whether to admit that we should give a realistic interpretation to our models of the universe at, and before, that time). But, in these circumstances, I see no good reason to accept the extrapolation beyond the Planck time which is required in order to arrive at an initial cosmological singularity. What there is good evidence for is the claim that the universe has expanded to its present size from a much smaller early universe; but this claim is quite compatible with the further claim that there was no initial cosmological singularity. (Note, by the way, that a bouncing, or oscillating universe, is not the only possible alternative. There are various other options--e.g. those involving world ensembles and wormholes--which might avoid an ex nihilo origination.) Graham Oppy, "Reply to Professor Craig" (1995)