An account of the men and women on the other side of the right stuff - they probe the billions of miles that separate the Earth from the moons of the other planets. The book tells the stories of scientists and spacecraft on the cutting edge of exploration and describes the remarkable discoveries. It recounts the daring missions, filled with drama, of manned flights to other planets - including the Pioneer and Voyager missions to Jupiter, Saturn, Uranus and Neptune. On the moons that we visit we find places where the ordinary rules don't apply and where life, even now, may be taking hold. They are strange, almost whimsical places, where volcanoes spew sparkling snow, and rivers run with scalding ammonia. Fires burning on one moon actually dust another's cliffs with ash. And in the most startling of these places all the essential ingredients for life are present.