Subrahmanyan Chandrasekhar was an Indian-American astrophysicist born on October 19, 1910. He is best known for his work on the structure and evolution of stars, particularly his discovery of the Chandrasekhar limit, which defines the maximum mass of a stable white dwarf star. His research significantly advanced the understanding of stellar evolution and black holes. In 1983, Chandrasekhar was awarded the Nobel Prize in Physics for his contributions to theoretical astrophysics. He spent much of his career at the University of Chicago, where he influenced many students and researchers. His legacy continues to impact the field of astrophysics today.