Edwin Hubble is credited for the initial development of the Big Bang theory, an idea which helps to explain the formation of the universe over 15 billion years ago. Which piece of evidence did Hubble find that led him to begin the development of the Big Bang theory?

Question

anonymous · Answer

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ineedhelplz · Answer

Edwin Hubble's arrival at Mount Wilson Observatory, California in 1919 coincided roughly with the completion of the 100-inch (2.5 m) Hooker Telescope, then the world's largest. At that time, the prevailing view of the cosmos was that the universe consisted entirely of the Milky Way Galaxy. Using the Hooker Telescope at Mt. Wilson, Hubble identified Cepheid variables in several spiral nebulae, including the Andromeda Nebula and Triangulum. His observations, made in 1922–1923, proved conclusively that these nebulae were much too distant to be part of the Milky Way and were, in fact, entire galaxies outside our own

wolf1728 · Answer

I'd say the "red shift".  The spectra of the stars, galaxies, were shifted to the "red" indicating that they were all moving away from us.  Why were they moving away form everything else? The Big Bang.