The Hubble Law describes the relationship between the distance of galaxies and their speed of recession from Earth. It states that the farther away a galaxy is, the faster it appears to be moving away. This observation supports the idea that the universe is expanding. The law is named after Edwin Hubble, an American astronomer who first formulated it in the 1920s. By measuring the redshift of light from distant galaxies, Hubble was able to demonstrate that the universe is not static but is continuously growing larger over time.