DAVID DARLING, Ph.D., is the author of The Complete Book of Spaceflight (Wiley); Life Everywhere; The Extraterrestrial Encyclopedia; Deep Time; Equations of Eternity (a New York Times Notable Book); Soul Search; and Zen Physics. He received his doctorate in astronomy from the University of Manchester, England, and now lives with his family in rural Minnesota.
More information on astronomy and spaceflight may be found at www.daviddarling.info.