By Julie Hannah

How likely is it that our universe is the result of random physical operations? Scientists point out that shaping the universe into its present form required a very precise balance of many finely-tuned physical constants such as these:

Gravitational attraction—This had to be in perfect balance with the rate of expansion to enable structures to form.The ratio of gravitational force to electromagnetic force—A slightly different ratio would have created stars that were either white dwarfs or blue giants, neither of which can support complex life.The electrical charge of electrons—If this were even slightly different, stars would not be able to burn hydrogen and helium, or would not explode to distribute heavy elements.The strong nuclear force—A slightly weaker force would have prevented the formation of heavy elements, but a slightly stronger force would have converted all hydrogen into other elements, resulting in no water and no fuel for stars to burn.Formation of carbon—Stars are only able to produce carbon from helium because the carbon nucleus has very specific values of spin and resonance energy.Initial entropy (disorder)—The entropy of our universe continues to increase, but it is still not at its maximum. Its initial value must therefore have been exceptionally small, with an extremely low probability of 1 out of 10^(10^123 ). This ridiculously large number has more zeros than the total number of protons and neutrons in the entire universe!

For carbon-based life such as ours to be possible, approximately twenty-six such physical properties had to have extremely precise and statistically improbable values. In addition, pairs of matter-antimatter particles annihilate each other, and matter only exists because one extra matter particle somehow came to be formed for every billion pairs. Scientists still do not understand how this imbalance could have arisen.

What about the theory of an infinite number of universes?

To avoid the implication of design, some scientists propose that there is an infinite number of universes with different physical laws. In that case, it is to be expected that ours could arise by chance with the specific properties necessary for human life. But there are problems with this theory.

Paul Davies writes: “It flies in the face of Occam’s razor, by introducing vast (indeed infinite) complexity to explain the regularities of just one universe. I find this ‘blunderbuss’ approach to explain the specialness of our universe scientifically questionable” (Mind of God, 218–19). (According to the principle of Occam’s Razor, the most likely explanation should have the least number of assumptions and conditions.)The multiverse theory cannot be scientifically proven because it does not provide testable predictions. In the opinion of physicist Peter Woit, the theory, therefore, does not lie within the domain of science: “Maybe we really live in a ‘multiverse’ of different possible universes . . . [But] this way of thinking about physics does not seem to lead to any falsifiable predictions, and so is one that physicists have traditionally considered to be unscientific” (Not Even Wrong, xi).Cosmologist George Ellis, co-author with Stephen Hawking, is critical of the theory. He argues that universes which actually exist, rather than merely being theoretically possible, would still require specific laws and would probably share a common causal connection. (See “Multiverses and Physical Cosmology.”)Any inflationary universe must have a beginning in time, which would still need an explanation. (See Borde and Vilenkin, “Eternal Inflation,” 1.)There are serious difficulties with trying to apply the mathematical concept of infinity to a physical situation. As mathematician David Hilbert pointed out,