Who discovered Evolution of stars?

The concept of stellar evolution was significantly advanced by the work of astrophysicists such as Sir William Herschel in the 18th century, but it was further developed in the 20th century by scientists like Subrahmanyan Chandrasekhar, who studied the life cycles of stars and the processes leading to phenomena like supernovae and black holes. The Hertzsprung-Russell diagram, created by Ejnar Hertzsprung and Henry Norris Russell, also played a crucial role in understanding how stars evolve over time based on their luminosity and temperature. Overall, the discovery of stellar evolution is attributed to the contributions of many scientists over time.