1929, Edwin Hubble examined the relation between distance and redshift of 46 galaxies by Observing the period-luminosity relationship of Cepheid variables along with earlier data Trom Vesto Slipher and Milton Humason. He did his work at the Mt. Wilson Observatory in California using the 100 inch (2.5m) Hooker telescope-then the largest one in the world. At that time, it was believed that the universe was entirely within the Milky Way galaxy. His observations proved that these galaxies were outside of the Milky Way. His findings were published first in The New York Times and then presented as a paper to the American Astronomical Society. Hubble showed that the greater the distance between any two galaxies, the greater their relative speed of separation. This would lead to a Hubble Constant

1929, Edwin Hubble examined the relation between distance and redshift of 46 galaxies by Observing the period-luminosity relationship of Cepheid variables along with earlier data Trom Vesto Slipher and Milton Humason. He did his work at the Mt. Wilson Observatory in California using the 100 inch (2.5m) Hooker telescope-then the largest one in the world. At that time, it was believed that the universe was entirely within the Milky Way galaxy. His observations proved that these galaxies were outside of the Milky Way. His findings were published first in The New York Times and then presented as a paper to the American Astronomical Society. Hubble showed that the greater the distance between any two galaxies, the greater their relative speed of separation. This would lead to a Hubble Constant