Is the Universe ‘fine-tuned’ by God so that we could live in it?
Before looking at the apparent fine tuning of the Universe, it might be useful to first look at what is known as the cosmological argument.
The cosmological argument
The cosmological argument sets out to logically infer the existence of God based upon the knowledge that the Universe had a beginning. A form of the argument recently made popular by the Christian philosopher William Lane Craig is known as the Kalam Cosmological Argument. This can be stated simply in just a few steps:
1. Whatever begins to exist has a cause.
2. The universe began to exist.
3. Therefore, the universe has a cause.
In order for something to bring the Universe into being, it must exist independent of the Universe, i.e. the cause must exist outside of both space and time. This cause must be beginning-less and itself uncaused. Lane Craig also argues that this cause must be personal. We only know of two types of immaterial object as described here, a mind, or abstract objects such as numbers. Numbers cannot directly cause things to happen, therefore the cause must be an intelligent mind.
4. There exists a personal creator of the Universe who is time-less, space-less, beginning-less, uncaused and enormously powerful.
The rise in popularity of the cosmological argument can partly be attributed to advances in scientific understanding. Up until around the 1930’s, the majority of physicists believed the Universe to be eternal, and so would have disputed point 2 in the above version of the argument. Over the past 80 years more and more observational evidence has accumulated showing that the Universe did indeed begin to exist at some point in the finite past (~13.7 billion years ago). In order to avoid the conclusion of a creator, some people have recently moved on to dispute point 1, that whatever begins to exist has a cause. The debate is too complicated to detail here however, and does not affect what is perhaps one of the most interesting problems to arise from modern cosmology: Why does the Universe appear to be so ‘finely tuned’ for life?
Fine Tuning
The laws of physics that govern the behaviour of our Universe can only really be understood when parameterised and expressed as mathematical equations. These equations often contain physical constants, an example can be seen in the well known E=mc2. Here we have as variables E (energy) and m (mass), however c (the speed of light in a vacuum) is a constant. There are over 20 such constants in modern physics, the majority of which have arbitrary values; there is no known reason why they have the values they do. A common hypothesis is that these parameters may be somewhat random. This may not at first seem very interesting, but if some of these constants were significantly different then the Universe would be a very different place.
In his book ‘Just Six Numbers’, Astronomer Royal Martin Rees discusses six constants that are fundamental to the present structure of the Universe. These numbers have to be almost exactly what they are in order for us to exist. Different values for just one or two of these parameters could have led to a universe full of black holes and nothing else, or maybe just a vast cloud of protons and electrons, neither of which would allow for the evolution of life.
The Universe appears to be finely tuned or designed in such a way that it is inhabitable. Why is this the case?
There are two main ways of answering this question:
Multi-verses and the Anthropic Principle
The Anthropic Principle states that the Universe, with all its different laws and constants, must be the way it is for us to exist, and so since we exist, we should not be surprised to observe what we do, no matter how unlikely. If the Universe were different, then we would not be here to see it.
While this is certainly true, it does not mean that we should not be surprised to be here at all. A very popular way of explaining away the improbability is by speculating that there are many universes (maybe an infinite number), each with a different set of random physical constants. In this model, there will be at least one universe that just happens to be ideally suited for life.
Some theories exist suggesting that the Universe is in fact oscillating in a series of Big-Bangs, where each time it expands, then re-collapses and starts again. These theories can be ruled out based on scientific observations demonstrating that no re-collapse can happen to our Universe.
An alternative has been suggested to allow many universes, even though there appears to be only one. In this theory there are many different universes all existing at the same time (The Multi-verse). Theoretically, this is a nice way of solving the fine tuning problem, since one of these universes is bound to appear like our own. But there is no evidence to support the idea, and even if it were true, there appears to be no way of ever proving it. This fact alone puts the idea well outside of what can be called science, it is really just speculation. For many people, scientists included, there is another explanation that fits better with what we see around us.
Conclusion
Based on the information that we have looked at, it seems that taken on face value there is a very strong case to be made for the existence of God. There certainly seems to be a design to the universe that we are in, and it seems that unless you have a prior commitment to naturalism, (that God can’t possibly be the answer) the most probable explanation of our existence in this finely tuned universe is that there as an intelligent designer, who created the universe we live in. This goes some way to explain why the apostle Paul was able to say that the existence of God was clear for all to see, (Rom 1:20) so that we can’t claim to have an excuse that God has not provided enough evidence for us.
From here the question becomes not ‘Does God exist?’, but ‘Who is God?’. At this point, it is worth looking at the identity of Jesus Christ. He made some astonishing claims which any thinking person must surely consider, but that is for another article.
Other useful articles:
What does it mean to become a Christian?
If you consider yourself a sceptic about Christianity or a Christian who is looking for honest answers to some of the toughest questions, then this book was quite simply written for you. Tim Keller is a pastor in New York, who has put into writing the kinds of questions that he is asked on a regular basis about Christianity such as ‘ How can a good God allow suffering?’, ‘Hasn’t science disproved Christianity?’ and ‘How can a loving God send people to hell?’