The Hubble law, representing observations of distant galaxies in the universe, relates which two parameters?

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The Hubble law relates the distance to a distant galaxy and its recession velocity. It is based on the observation that galaxies are moving away from us at a rate proportional to their distance from us. This relationship is encapsulated in Hubble's law, which states that the recessional velocity of a galaxy is proportional to its distance from us. The proportionality constant between the velocity and distance is called the Hubble constant.

The Hubble Law, Representing Observations of Distant Galaxies in the Universe