The Fallacy of the Fine-Tuned Universe
Great Mysteries of Physics 2: is the universe fine-tuned for life?
It won't be long in any debate forum with Creationists, or even theists who are not Bible literalists but still like to think their magic invisible friend created the Universe with them in mind, that someone will claim the Universe is fine-tuned for life. The claim is that there are about 30 constants which all have to have just the values they have for intelligent life to exist.
There are of course many problems with this claim, most of which the person making it will be completely unaware, having only read what they want to believe and not anything that might contradict their 'faith'.
The main ones are:
- In effect, they are arguing that their putative creator god can only create life within very narrow parameters, and yet an omnipotent god who allegedly created the 'rules' should be capable of creating anything it wants to create in any given set of parameters. So, if the creator constrained by natural laws and incapable of working outside its limitations? If so, who or what set those limitations.
The fine-tuned argument is actually an argument against the existence of an omnipotent creator god, not for one. - Discussions about the existence of intelligent life can only be conducted in a Universe in which intelligent life exists, therefore, the fact that the debate is taking place means the Universe must be capable of giving rise to intelligent life. Trying to work out the probability of something happening that has already happened is statistical nonsense. The probability is 1 (certainty).
- Assuming those constants do have a range of possible values (and that's only an assumption with no evidence ever presented), in order to calculate the probability of it having the value it has in this Universe, we would need to examine a large sample of universes. That of course is impossible, so, for all we know, the probability of any constant having its current value may be certainty, i.e. it might not be capable of having any other value. That the probability of it having its current value being unlikely, is merely an assumption - a claim without evidence which can be dismissed without evidence.
- In this universe, the vast majority of it is highly hostile to life as we know it. Even in this planetary system, life can only exist on one planet, and intelligent (human) life can only exist on a fraction of the surface of this planet and within a few thousand feet of its surface without special equipment. So, far from being fine-tuned for life, almost all of it is fine-tuned to make life impossible.
- Earth is not particularly well designed for human life (which is what Creationists men by 'intelligent life'). It is tectonically active which means it is subject to frequent natural disasters such as earthquakes, volcanoes and tsunamis; humans cannot survive for long and without equipment in the oceans or at the top of mountains, in deserts of at the poles. Earth is subject to occasional cosmic disasters such as meteorite strikes and it orbits a sun which will one day destroy it by turning into a red giant, hence intelligent life such as that on Earth will only exist for a fraction of the time the Universe will exist.
- There are very many more black holes in the Universe than there are humans, so it would be more logical to argue that the Universe is fine-tunes for making black holes.