Subramanyan Chandrasekhar was an Indian-American astrophysicist who made significant contributions to the field of theoretical astrophysics and won the Nobel Prize in Physics in 1983. He was born on October 19, 1910, in Lahore, British India (now Pakistan), and passed away on August 21, 1995, in Chicago, United States. Chandrasekhar's most notable work was on the structure and evolution of stars. In the 1930s, he proposed the concept of Chandrasekhar's limit, which states that when a star's mass exceeds a certain threshold, known as the Chandrasekhar mass, it will undergo gravitational collapse and become a white dwarf. This concept laid the foundation for understanding the life cycles of stars and the formation of stellar remnants.