In this contribution, it is shown how the fine-structure constant emerges when two systems interact, one of which, light, perceives the universe as static due to not experiencing the passage of time, while the other, matter, experiences accelerated expansion. In this way, the fine-structure constant can be related to the rate of expansion of the universe; In this way, the fine-structure constant can be related to the rate of expansion of the universe: can thus be expressed as the ratio of the theoretical radius of the universe R(uT)=13.6-13.8 Gly and the observed radius R(uI) = 46.5 Gly. α = (13,6 Gly/46,5 Gly)^4 = 1/137 (1.21) From the above, it is clear that, since the rate of expansion of the universe has not remained constant over time, the value of the fine-structure constant must also have changed (unless there is over time a proportional variation of the speed of light ), as have other physical constants and quantities. This implies that physical laws have not remained unchanged throughout the history of the universe. Regarding the spatial variation of , the issue is more complex and falls outside the scope of this work.