What relationship, formulated by Hubble in 1929, demonstrated that the universe was not static?

Answer

The velocity at which a galaxy recedes is proportional to its distance from us

This relationship, known as Hubble’s Law, provided the observational proof that the universe was expanding, meaning the fabric of spacetime itself was stretching.

What relationship, formulated by Hubble in 1929, demonstrated that the universe was not static?
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