Are Cosmic and Planetary Fine-Tuning Constant?
A Fortunate Universe, aaas, catastrophes, Children of Light, cosmic fine-tuning, fusion, Geraint Lewis, Guillermo Gonzalez, habitability, heavy elements, Jay Richards, law of gravity, Luke A. Barnes, Michael Denton, Michael R. Wilczynska, natural constants, Paul Dirac, photosynthesis, physicists, Physics, Earth & Space, planetary fine-tuning, Science Advances, stars, The Privileged Planet, The Wonder of Water
Since Paul Dirac first wrote about the subject of cosmic coincidences in 1937, many physicists have marveled at the specific values of natural constants, such as G, the constant in the law of gravity (6.673×10-11 N m2 kg-2) — an extremely low number. This is an empirical value measured carefully in labs under controlled conditions; it is not derived from equations. One could imagine it taking a different value. But it is balanced between two catastrophes. If stronger, stars would burn hotter, and photosynthesis would be impossible, and life, if it could exist at all under the crush of gravity, would have to take refuge underground. If gravity were weaker, opposite problems ensue: stars would be unable to start fusion and form heavy elements, and would slowly burn out by…