Do you believe to anthropic principle?

There can be thousand of theories and we cant be sure which one is true.

The anthropic principle says, roughly, that the existence of life in the Universe can set constraints on the way the Universe is now, and how it got to be the way it is now. In order for us to exist, there has to be one star (the Sun), orbited at the appropriate distance by one planet (the Earth), made of the right mixture of chemical elements (particularly including carbon, nitrogen, oxygen and hydrogen: four elements that play a key role in life processes).



In 1923, astronomer Arthur Eddington agreed: "It is difficult to account for the occurrence of a pure number (of order greatly different from unity) in the scheme of things; but this difficulty would be removed if we could connect it to the number of particles in the world—a number presumably decided by accident. He estimated that number, now called the "Eddington number," to be N =1079. Well, N is not too far from the square of N1.

In 1937, physicist Paul Dirac noticed that N1 is the same order of magnitude as another pure number N2 that gives the ratio of a typical stellar lifetime to the time for light to traverse the radius of a proton. That is, he found two seemingly unconnected large numbers to be of the same order of magnitude. If one number being large is unlikely, how much more unlikely is another to come along with about the same value?

In 1961, astrophysicist Robert Dicke pointed out that N2 is necessarily large in order that the lifetime of typical stars is sufficient to generate heavy chemical elements such as carbon Furthermore, he showed that N1 must be of the same order of N2 in any universe with heavy elements. Thus, this became the first of what are called the anthropic coincidences, connections between physical constants that seem to be necessary for the existence of life in the universe.

The WAP is considered by most physicists and cosmologists to be a simple tautology. Ofcourse the constants of nature are suitable for our form of life. If they were not, we would not be here to talk about it. Obviously, life evolved on Earth because conditions here were right.

Still, the anthropic coincidences strike most people as puzzling and they wonder what might infer about the nature of the universe.