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This is a concise review, addressed to undergraduate students, of S.Chandrasekhar's oeuvre in astrophysics, ranging from his early studies on whitedwarfs using relativistic quantum statistics to topics as diverse as dynamicalfriction, negative hydrogen ion, fluid dynamical instabilities, black holes andgravitational waves. The exposition is based on simple physical explanations inthe context of observational astronomy. Black holes and their role as centralengines of active, compact, high energy sources have been discussed.

S. Chandrasekhar: White Dwarfs, $H^-$ ion,.., Black holes, Gravitational waves