Hubble's law is the observation that galaxies recede from an observer at a speed roughly proportional to their distance, formulated by Edwin Hubble in 1929 from measurements of galactic redshifts, and now understood as direct evidence of the expansion of the universe. The constant of proportionality, the Hubble constant, sets the present-day expansion rate and is a central quantity in cosmology, though measurements of its precise value by different methods have historically disagreed, a discrepancy known as the Hubble tension. The law does not imply Earth occupies any special position, since the same proportional recession would be observed from any galaxy in a uniformly expanding universe.
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Hubble's law (Wikipedia)
Lead section
Hubble's law, officially the Hubble-Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance.
Wikipedia, Hubble's law, History section
The discovery of Hubble's law is attributed to work published by Edwin Hubble in 1929, but the notion of the universe expanding at a calculable rate was first derived from general relativity equations in 1922 by Alexander Friedmann.
In Group: Big Bang Cosmology and Measurements, Lead sentence
Hubble's law, officially the Hubble-Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance.
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