Henry Norris Russell

Henry Norris Russell was an influential American astronomer known for his groundbreaking work in stellar classification and the understanding of stars. He is best known for developing the Hertzsprung-Russell diagram, a crucial tool in astronomy that plots stars according to their brightness and temperature. This diagram helps astronomers understand the life cycles of stars, from their formation to their end stages. Russell's contributions significantly advanced our knowledge of how stars evolve and relate to one another in the universe, making him a key figure in modern astrophysics.