Ejnar Hertzsprung (Winther)

Ejnar Hertzsprung was a Danish astronomer who, along with others, developed a way to categorize stars based on their brightness and temperature. He created the Hertzsprung-Russell diagram, a graph that plots stars' luminosity against their temperature or color, revealing patterns in stellar properties. This diagram helps astronomers understand how stars evolve over time, showing that stars follow certain life paths from birth to death. Hertzsprung's work is fundamental to astrophysics, allowing scientists to study stellar life cycles and the structure of our galaxy more effectively.