How do we know that the fundamental constants are constant? We don’t.

Through a variety of tests on Earth and throughout the universe, physicists have not measured any changes in time or space for any of the fundamental constants of nature.

All modern physics rests on two basic pillars. One of them is Einstein’s theory of general relativity, which we use to explain the force of gravity. The other is the Standard Model, which we use to describe the other three forces of nature: electromagnetism, the strong nuclear force, and the weak nuclear force. Using these theories, physicists can explain the vast swathes of interactions throughout the universe.


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