"Version: 20190401"--Title page verso."A Morgan & Claypool publication as part of IOP Concise Physics"--Title page verso.Includes bibliographical references.1. Introduction -- 2. Waves -- 3. The Special Theory of Relativity -- 4. The General Theory of Relativity -- 4.1. Gravitational radiation -- 5. The life of massive stars -- 5.1. Neutron stars -- 6. Black holes -- 6.1. Some properties of bla…