3) Anthropic reasoning has been used to address the question as to why certain measured physical constants take the values that they do, rather than some other arbitrary values, and to explain a perception that the universe appears to be finely tuned for the existence of life.
5) All told, it takes at least 26 separate fundamental constants to describe the Universe that we presently understand, and we have no idea why these constants have the values that they do. If some of these constants were either too small or too large, our Universe as we know it would be impossible; our very existence is evidence that the laws of nature must be consistent with our existence being possible. If gravity were a little bit stronger or weaker, stars, galaxies, planets, and life would still exist. Same with:
- the strengths of the other forces,
- the masses of the quarks,
- or the value of the speed of light.