This book is designed to be an advanced undergraduate or graduate level text book on Extragalactic astrophysics. It is specifically designed for programs that do not have separate classes in cosmology and galactic structure. The book contains mathematical rigor including some general relativity and covers most topics in galactic structure, galaxy evolution, and cosmology. Created using lecture notes gathered by the author over 15 years of teaching astrophysics, this book has been refined and updated as new discoveries have been made, and as theories have gained traction. The second edition contains over 50 pages of new and updated material, and questions have been added to the end of each chapter. Coverage of new discoveries such as neutrinos detected from a blazar and new gravitational wave detections has been added, and the sections on cosmology have been expanded. Key Features:Aimed at advanced undergraduate and graduate level studentsClass-tested, the result of 30 years teaching experienceConcise, but including the most important topics in extragalactic astrophysics