The universe is a very strange place and to me, the most bizarre objects are black holes. They are things where the gravitational attraction is so strong that not even light can move fast enough to get away. While the complete definition of black holes requires a great deal of sophisticated mathematics, the fundamental principles are easy to understand. No one is better at explaining science and in this thorough, non-mathematical explanation of how black holes can exist, Asimov is at his best. Asimov handily explains the workings of the Universe to his point in time (roughly 1986). He organizes the book logically, beginning with basic concepts such as mass and the simple structures of matter, and finishing with the complete cycle of stellar evolution.
