Subrahmanyan Chandrasekhar was an Indian-American astrophysicist. He shared the 1983 Nobel Prize in Physics "for his theoretical studies of the physical processes of importance to the structure and evolution of the stars." His mathematical treatment of stellar evolution yielded many of the current theoretical models of the later evolutionary stages of massive stars. The Chandrasekhar limit describes the maximum mass of a white dwarf. Above it, a stellar remnant will collapse to form a neutron star or black hole. Many concepts, institutions and inventions, including the Chandra X-Ray Observatory, are named after him. The Nobel Prize in Physics 1983, announced October 19, 1983. Subrahmanyan Chandrasekhar (1/2), “for his theoretical studies of the physical processes of importance to the structure and evolution of the stars”. William A. Fowler (1/2), “for his theoretical and experimental studies of the nuclear reactions of importance in the formation of the chemical elements in the universe”. Subrahmanyan Chandrasekhar: born 1910, Lahore, India (now Pakistan). William A. Fowler: born 1911, Pittsburgh, PA, USA. Wiki link Wiki link Data: the Nobel Foundation (CC0).