The concept of other universes has been proposed to explain why our universe seems to be fine-tuned for conscious life as we experience it. If there were a infinite number of different physical laws in as many universes, some of these would have laws that were suitable for stars, planets and life to exist.
The weak anthropic principle could then be applied to conclude that we would only consciously exist in those universes which were finely tuned for our conscious existence. Thus, while the probability might be extremely small that there is life in most of the universes, this scarcity of life-supporting universes does not imply intelligent design as the only explanation of our existence.
We must be prepared to take account of the fact that our location in time as well as space is necessarily privileged to the extent of being compatible with our existence as observers. The observed values of all physical and cosmological quantities are not equally probable but they take on values restricted by the requirement that there exist sites where carbon-based life can evolve.
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