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Gravity is roughly 1039 times weaker than electromagnetism. If gravity had been 1033 times weaker than electromagnetism, "stars would be a billion times less massive and would burn a million times faster."
The nuclear weak force is 1028 times the strength of gravity. Had the weak force been slightly weaker, all the hydrogen in the universe would have been turned to helium (making water impossible, for example).
A stronger nuclear strong force (by as little as 2 percent) would have prevented the formation of protons--yielding a universe without atoms. Decreasing it by 5 percent would have given us a universe without stars.
If the difference in mass between a proton and a neutron were not exactly as it is--roughly twice the mass of an electron--then all neutrons would have become protons or vice versa. Say good-bye to chemistry as we know it--and to life.
Weak Anthropic Principle (WAP): 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 and by the requirements that the Universe be old enough for it to have already done so.
Strong Anthropic Principle (SAP): The Universe must have those properties which allow life to develop within it at some stage in its history. Because:
There exists one possible Universe 'designed' with the goal of generating and sustaining 'observers'. Or...
Observers are necessary to bring the Universe into being (Wheeler's Participatory Anthropic Principle (PAP)). Or...
An ensemble of other different universes is necessary for the existence of our Universe (which may be related to the Many_Worlds interpretation of quantum mechanics).
Final Anthropic Principle (FAP): Intelligent information-processing must come into existence in the Universe, and, once it comes into existence, it will never die out.
Participatory Anthropic Principle
The early multiverse can perhaps be thought of as a massively parallel quantum computer which explored all of possibility-space until it was able to generate a living body, which became the habitation of an observing, sentient being. At that moment the multiverse collapsed into the actuality of that one alternative environment. This theory is known as the Participatory Anthropic Principle and was first put forward by the physicist John A.Wheeler in 1983.