Astrophysics is often regarded as incomprehensible without the use of higher mathematics. This book cuts through the difficult mathematics and explains the basics of astrophysics in accessible terms. Using nothing more than plain arithmetic and simple examples, the workings of the universe are outlined in a straightforward yet detailed and easy-to-grasp manner. New theories in astrophysics in the eight years since the first edition are reflected in new and expanded chapters. Includes an observing list for each topic under discussion so observers can actually see for themselves the concepts presented--stars of the spectral sequence, nebulae, galaxies, even black holes.