A sequenced course of 24 projects for school or home experimenters. Some are very simple (holding an iron wire over a gas stove flame to demonstrate that red stars are the coolest, blue-white the hottest); some require purchased equipment such as chemicals, test tubes, or a toy train transformer and earphones; some are exercises in creative imagination (devise a picture language for TV transmission to a distant planet); and some call on readers to apply Newton's laws of motion to the observed phenomena (a rubber-band launch, a match-flame-in-foil-wrap rocket). Several, duly labeled, require caution, and others might benefit from an adult on hand to explain such undefined terms as projectile. Overall, there's a refreshing variety of projects and a refreshingly broad interpretation of ""space scientist""--plus the attraction of Morrison's jaunty cartoons.