Anyone interested in a first hand account of NASA‘s robotic missions to the moons of Jupiter and Saturn will find Moon Hunters: NASA’s Remarkable Expeditions to the Ends of the Solar System by Jeffrey Kluger to be a great read. Various moons, like Europa and Titan, may harbor forms of life and the only way to find out is to explore them. The book narrates the discoveries of various probes, such as Ranger, Voyager, and Galileo.