This four-volume set contains over 3000 articles covering a broad range of topics in astronomy and astrophysics, making it one of the largest reference sources available on the topic. Murdin (End of Fire: The Supernova in the Large Magellanic Cloud) and his editorial board have assembled more than 800 astronomers and astrophysicists, who produced both lengthy main articles tackling main themes in astronomy and briefer, unsigned entries. The 600-plus main articles range from 2500 to 5000 words and offer illustrations and bibliographic references, which sometimes include web sites. The shorter, unsigned articles are descriptions of space vehicles and missions, messier objects, observatories, definitions, and biographies. Most of the 2000 illustrations are black and white, with a few color-plate inserts grouped in the middle of each volume. An online version (www.ency-astro.com) offers full-text searching, hyperlinked cross references, and quarterly updates. The interface is easy to navigate, but some features, such as the subject browse, load slowly. Interest in astronomy is growing, fueled by recent discoveries, and the current encyclopedia serves as an updated, comprehensive resource. It is considerably more inclusive than either the McGraw-Hill Encyclopedia of Astronomy (LJ 4/15/93) or The Encyclopedia of Astronomy & Astrophysics (Van Nostrand Reinhold: Wiley, 1992). Suitable for scientists, students, and amateur astronomers, this work is recommended for academic libraries. Teresa Berry, Univ. of Tennessee Libs., Knoxville Copyright 2001 Cahners Business Information.