William Wilson Morgan

William Wilson Morgan was an influential American astronomer best known for his work in stellar classification and astrophysics. He developed the Morgan-Keenan (MK) system, which classifies stars based on their temperature and luminosity. This system helps astronomers understand the properties and evolution of stars. Morgan's research improved our knowledge of the structure of our galaxy and the distribution of different types of stars, contributing significantly to the field of astrophysics and shaping how we study stellar populations today. His work remains vital in the ongoing exploration of the universe and its celestial objects.