I've read online that the fine-structure constant (alpha) is at a sort of "goldilocks value" for life generation; if it were 4% lower, stars would not produce carbon or oxygen in their fusion, and if it were greater than 0.1, fusion simply wouldn't occur. These are interesting facts, but can anyone tell me what else might change if alpha were at a higher or lower value? Say, a ten percent increase or decrease? Would it affect the speed of light, gravity, atomic bonds, or other fundamental forces? The alpha constant interests me because it is linked to so many other constants in physics. Originally I wanted to know about the Heisenberg uncertainty principle and how it might be affected by a change in the Planck constant, but most answers from physicists online said that changing Planck's constant is essentially meaningless because it has units, so to change its definition one must change the alpha constant. Even more fascinating is the idea in several articles I read that the alpha constant might be changable over time and space, so asking what would happen isn't a purely hypothetical exercise. Thoughts?