Today scientists don’t hesitate to acknowledge this wondrous fact of how tailor-made to life our universe is. Or, as Anthony Flew declared in There is a God: How the World’s Most Notorious Atheist Changed His Mind, that ‘the laws of nature seem to have been crafted so as to move the universe towards the emergence and sustenance of life.’2
And what precisely is the cause of this enchantment? Or on what grounds do so many cosmologists believe that the universe is compelled, in some sense, for conscious life to emerge in it? Well, it all has to do with our universe’s remarkable fine-tuning of its most basic, fundamental forces. Let me elaborate:
Cosmologists tell us, for instance, that had the force of gravity been a fraction weaker than it is: by 1 part in 1040 (that is, one followed by forty zeros), matter couldn’t have clumped together to form galaxies or stars. The universe would have been a lifeless sea of drifting gas of interminable darkness.
Had gravity been ever so slightly stronger, the universe would be radically different than it is now. Matter would clump together more aggresively. Stars could still exist, but they would be far smaller and burn out much more quicker than the time needed for complex planetary life to evolve. If it did manage to evolve, even insects would need thicker legs to support themselves because of the increased gravitational tug; indeed gravity would crush anything as large as ourselves. And that is assuming that planets could be stable. For in a strong-gravity universe, stars will be packed far closer together, making stellar collisions frequent. Planetry existence would thus be very unlikely, or extremely unstable.
So precisely-tuned is the force of gravity in relation to the other forces which operate throughout the universe that, had the initial explosion of the Big-Bang differed in strength by as little as 1 part in 1060, then the universe would have either collapsed back on itself or expanded too rapidly for stars to form. This incredibly slim margin is likened to firing a bullet at a fifty pence coin at the other side of the universe, billions of light-years away, and actually hitting the target!
A similar story holds true for the force binding protons and neutrons together in an atom: the strong nuclear force. Had it been a tad weaker, only hydrogen atoms could have formed; nothing else. If the strong nuclear force had been slightly stronger, the nuclear furnace which rages within the centre of stars would not be able to produce heavy elements like carbon, which is critical for all biological life. Again, the nuclear force appears to be tuned just sufficiently for carbon atoms to form.
Another example of such cosmic coincidences is the electromagnetic force: the force that causes the interaction between electrically-charged particles. If it was a tiny bit stronger, electrons would be bound to atoms so tightly that no chemical interactions could take place between atoms, which essentially means no life! On the other hand, if it were a fraction weaker than it is, electrons could not be bound to the nucleus of atoms, and thus no molecules could even form to give rise to life.
That our universe seems uniquely tuned to give rise to life; more specifically, human life, is known as the Anthropic Principle. And it remains a source of intense wonder, debate and speculation among scientists, philosophers and theologians since it was fullly appreciated a few decades ago.
All in all there are fifteen cosmological constants which, because they have the values and parameters they have, allow the emergence of a universe capable of supporting complex life.
Some have imaginatively likened the anthropic principle to a series of radio dials, with each instance of fine-tuning representing one dial. Unless all the dials are tuned to exactly the right settings, life would be utterly imposible. In his Just Six Numbers, Britain’s Astronomer Royal, Martin Rees, states that such finely-tuned cosmological constants, ‘constitute a “recipe” for a universe. Moreover, the outcome is sensitive to their values: if any one of them were to be ‘untuned’, there would be no stars and no life.’3 ‘The chance,’ says Francis Collins, head of the human genome project, ‘that all these constants would take on the values necessary to result in a stable universe capable of sustaining complex life forms is almost infinitesimal. And yet those are exactly the parameters we observe.’4
McGrath tells us that the first few decades of the twentieth century were dominated by a scientific belief that the universe had always existed, and so for most scientists of the time, there was no good reason to deliberate upon what brought it into existence. Religious language about creation was seen as backwardness: mythological nonsense incompatible with cutting-edge scientific knowledge. By the 1960s, though, it became increasingly apparent to the scientific community that the universe did have an origin; a starting point – the Big Bang. Although the idea was initially met with fierce dismissal by some atheist scientists of the day, such prejudice was overwhelmed by the evidence in its favour.5
Both the Big-Bang and the growing realisation of how the universe is finely-tuned for life have seriously altered the tone of the debate in terms of God, science and reason. Nonetheless, as suggestive as fine-tuning may be, its explanation continues to stoke intense debate in scientific, theological and philosophical circles.
Three explanations are offered for the remarkable fine-tuning of our cosmos. The first is a sort of shrug of the shoulder response. That is, things are what they are, or we would not be here to discuss them. We are just very lucky. To this “it’s just the way things are” attitude, Rees writes the following: ‘Many scientists take this line, but it certainly leaves me unsatisfied. I’m impressed by a metaphor given by the Canadian philosopher John Leslie. Suppose you are facing a firing squad. Fifty marksmen take aim, but they all miss. If they hadn’t missed, you wouldn’t have survived to ponder the matter. But you wouldn’t just leave it at that – you’d still be baffled, and would seek some further reason for your good fortune.’6
The second continues to attract a growing number of advocates: There are multiple universes parallel to ours, each governed by different laws and defined by different values. Our universe is simply a result of trial and error in that it is one wherein all the anthropic constants act in concert to allow life. A setback with the “multiverse” hypothesis, its incredulity aside and its seemingly opportunistic reasoning, is that it only postpones the crucial question. Instead of asking how our universe came about, we now must ask how these multiple universes emerged. Another drawback with it has to do with Ockham’s Razor. This is the rule that insists, ‘All other things being equal, simpler explanations are generally better than more complex ones.’ Invoking an infinite number of universes lacking empirical testability or observability, because they are in a different spacetime framework, is indeed extremely complex.
The last invokes divine providence. This is the belief that a wise, omnipotent Maker made the universe, endowing it with purpose, meaning and remarkable beauty for the specific intention of producing man. Stephen Hawking remarked in A Brief History of Time – in what seems like a moment of epiphany: ‘It would be very difficult to explain why the universe should have begun in just this way, except as the act of a God who intended to create beings like us.’7
The Qur’an insists: And We created not the heavens and the earth and all that is between them in vain. That is the opinion of those who disbelieve; so woe to the disbelievers because of the Fire! [38:27]
1. Dyson, Disturbing the Universe, 250 – in Barrow & Tipler, The Anthropic Cosmological Principle (Oxford: Calarendon, 1988), 318.
2. Antony Flew, There is a God (USA: HarperCollins, 2008), 114.
3. Just Six Numbers (Great Britain: Phoenix Books, 1999), 4.
4. The Language of God (London: Simon & Schuster, 2007), 74. Cf. the account of the anthropic principle by physicist and Christian theologian John Polkinghorne, Beyond Science (Cambridge: Cambridge University Press, 1998), 80-92.
5. Why God Won’t Go Away (London: Society for Promoting Christian Knowledge, 2011), 84-5.
6. Just Six Numbers, 164-66.
7. A Brief History of Time (New York: Bantam Press, 1998), 144. I am not suggesting by this statement that Hawkins is a theist. But simply showing that the universe having a wise, omnipotent Maker is more than within the scope of reason and sound logic.