[Saturn and Beyond] consists of a historical description of what we know about the outer parts of the solar system and how we found the information. The author is very careful to indicate what sort of data are still uncertain, such as the sizes, and hence the densities, of the smaller satellites of the outer planets. He also points out fallacies in various theories of the origin of the system, which are apparent if the supposedly measured values are right; and he doesn't try to push us toward a favored choice of his own…. The book is sufficiently up to date to have the information on Pluto's moon, though the author either missed or didn't trust the radar evidence that the particles in Saturn's rings are about snowball size (I'm not sure how far I trust it myself). I caught only one slip; it is true that eclipses...