This self contained textbook brings together many different branches of physics e.g. nuclear physics, solid state physics, particle physics, hydrodynamics, relativity to analyze compact objects. The latest astronomical data is assessed. Over 250 exercises. This self--contained textbook brings together many different branches of physics----e.g. nuclear physics, solid state physics, particle physics, hydrodynamics, relativity----to analyze compact objects. The latest astronomical data is assessed. Over 250 exercises. Star Deaths and the Formation of Compact Objects. Cold Equation of State Below Neutron Drip. White Dwarfs. Cooling of White Dwarfs. General Relativity. The Equilibrium and Stability of Fluid Configurations. Rotation and Magnetic Fields. Cold Equation of State Above Neutron Drip. Neutron Star Models: Masses and Radii. Pulsars. Cooling of Neutron Stars. Black Holes. Compact X-Ray Sources. Accretion Onto Black Holes. Accretion Onto Neutron Stars and White Dwarfs. Gravitational Radiation. Supermassive Stars and Black Holes. Stellar Collapse and Supernova Explosions. Appendixes. References. Author Index. Subject Index.