What evidence did Hubble base his thinking on?

Edwin Hubble based his thinking on several key pieces of evidence, notably his observations of distant galaxies and their redshifts. He discovered that most galaxies are moving away from us, with their light shifted to longer wavelengths, indicating an expanding universe. This led him to formulate Hubble's Law, which correlates the distance of a galaxy with its recessional velocity. His findings challenged the prevailing view of a static universe and provided crucial support for the Big Bang theory.