John S. Lewis

Leik N. Myrabois an aerospace engineer who has conducted research in an effort to create viable concepts for nonchemical propulsion. He is a former staff scientist and research consultant on directed energy applications, aerospace systems, space prime power, and advanced propulsion. He lives in Benington, Vermont.John S. Lewisis a professor of planetary science at the University of Arizona’s Lunar and Planetary Laboratory. He is the author ofMining the Sky,Physics and Chemistry of the Solar System,Rain of Iron and Ice, andWorlds Without End. He lives in Tucson, Arizona.