Hubble wasn't the first to find evidence of expansion

History loves to hand the wrong guy the trophy. Years before Edwin Hubble became the poster boy for the expanding universe, Vesto Slipher was quietly measuring the galactic redshift of spiral nebulae. He proved these galaxies were hurtling away from us at terrifying speeds, only for Hubble to casually stroll in later, use the data, and take all the cosmic glory.