Gr 4-6-This astronomical tour is unusually well designed, imparting an astonishing amount of specific information in topical spreads that never look busy or overstuffed. It's not all just dry, undigested data either; Graun points out, for instance, that the Martian supervolcano Olympus Mons is the size of Arizona, and that from the lunar surface Earth may show phases like the Moon, but never rises or sets. Making heavy use of sharply reproduced space photos, and consistently noting when they are composites or computer enhanced, the author aims his presentation at active young sky watchers as well as armchair tourists. He supplements the several paragraphs of narrative text on each spread with fact boxes, an image of the relative size of the sun from each planet, and, frequently, particular physical features to search out with binoculars or a telescope. An associated commercial Web site offers both updated information and an array of related links that will extend the book's shelf life. Here's proof that, with the right tour guide, readers can find fresh insights and eye-widening mysteries in even the most well-traveled territory.-John Peters, New York Public Library Copyright 2001 Cahners Business Information.