Gr 5-9-These interesting and useful additions describe the "discovery" of the solar system and the scientific laws governing its operation, before moving on to the planet or planets to be covered in each volume. Mercury and Pluto pairs the planets at the opposite extremes of the Sun's family. The discovery of Pluto's intriguing moon, Charon, is covered at some length. Saturn chronicles the growth of our knowledge of the structure and nature of its rings and moons. Unfortunately, a two-page chart detailing the moons is printed in two shades of orange, making it hard to read. In both books, concepts are explained clearly, and helpful diagrams and carefully chosen illustrations assist understanding. Ample white space makes the books appealing to browsers as well as to report writers. Updated entries in the "Exploring the Solar System" series (Heinemann Library) and "Out of This World" series (Watts) are comparable in scope and presentation. Libraries will want to consider Miller's titles as solid choices as well.-Elaine Fort Weischedel, Millbury Public Library, MA Copyright 2003 Reed Business Information.