In what year did Hubble publish his monumental finding establishing the relationship now known as Hubble's Law?

Answer

1929

Hubble's monumental finding, published in 1929, established that the velocity at which a galaxy recedes is directly proportional to its distance from Earth, a relationship termed Hubble's Law.

In what year did Hubble publish his monumental finding establishing the relationship now known as Hubble's Law?
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