The term fine-tuned universe refers to the idea that conditions that allow life in the universe can only occur with the tightly restricted values of the universal physical constants, and that small changes in these constants would correspond to a very different universe, not likely conducive to the establishment and development of matter, astronomical structures, or life as it is presently known.The arguments relating to the fine-tuned universe concept are related to the anthropic principle, which states that any valid theory of the universe must be consistent with our existence as human beings at this particular time and place in the universe. In other words even though the actual probability of a universe to be one which supports intelligent life is very low, the conditional probability given our existence in it is 1 — and even if there are other universes devoid of life, there will be no one to observe them.
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