Description: (American Astronomer and Astrophysicist Known for Helping Prove the Existence of Spiral Arms in Our Galaxy)
Mostly known for his life-long association with the University of Chicago’s Yerkes Observatory, astronomer William Wilson Morgan was the first to prove that the Milky Way has spiral arms. Apart from co-developing the MK system of classification of stars, he also co-established the Bautz-Morgan classification system for clusters.