How do we know that the fundamental constants are constants? we do not

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

All modern physics rests on two main pillars. One is Einstein’s theory of general relativityWhat do 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. With these theories, physicists can explain vast swaths of interactions throughout the universe.

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