If the fundamental constants of nature differed from their measured values, life as we know it would not have emerged. Stars are witness to the forces of electromagnetism and gravity – displace this equilibrium and the existence of nuclear-burning stars is at risk. In such a universe, stars would never have formed, or might have collapsed to black holes.
Theories of the multiverse suggest that life-containing universes are incredibly rare. We live in one of these, whether by cosmological natural selection or by the consequences of a theory yet to be formulated.
Related channels: THE UNIVERSE