Even before the Big Bang theory of the universe came into vogue, Edwin Hubble talked of "nebulae" swirling at great distances from Earth, with stars so far away, they appeared as thin mist in his telescope. The red glint in faint light wavelengths gave him the notion of a powerful force moving at tremendous speeds and that the more distant the nebulae, the faster they moved away from Earth.
Edwin Powell Hubble was a sky walker, a cruiser of far-off galaxies whose brilliance and curiosity led to his discovery of the fundamental structure of something as large as the universe.
At the time he arrived at this startling idea, he was a brilliant 30-something, explaining mysteries of the universe and how it works. He called it, naturally, Hubble’s Law, which clarified the rate the universe expanded in all directions.