Edwin Powell Hubble — American Scientist born on November 20, 1889, died on September 28, 1953

Edwin Powell Hubble was an American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century. Hubble is known for showing that the recessional velocity of a galaxy increases with its distance from the earth, implying the universe is expanding, known as "Hubble's law" although this relation had been discovered previously by Georges Lemaître, who published his work in a less visible journal... (wikipedia)

Equipped with his five senses, man explores the universe around him and calls the adventure Science.
The history of astronomy is a history of receding horizons.
We find them smaller and fainter, in constantly increasing numbers, and we know that we are reaching into space, farther and farther, until, with the faintest nebulae that can be detected with the greatest telescopes, we arrive at the frontier of the known universe.
The great spirals... apparently lie outside our stellar system.