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Colour images, detailed figures and informative tables enliven this accessible introduction to the dirty snowball remnants of the birth of our planetary system. Comet Science by Jacques Crovisier and Therese Encrenaz spans the range from historical drawings to spacecraft investigations, from visual images to infrared and radio maps and spectra, and from old favourites like Comet Halley to new ones like Comet Hale-Bopp. Published by Cambridge University Press, £14.95, ISBN 0521645913.