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Discovering the little moon also reinforces the theory that most dwarf planets have moons. Ganymede, and four other moons dwelling in our Sun's family, possess liquid water beneath their frigid crusts of ice. The others are Saturn's moons, Titan and Enceladus, and two other Galilean moons of Jupiter--Europa and Callisto. Planetary scientists think the oceans of Europa and Enceladus are in contact with rock--thus making these two moons high-priority targets for future astrobiology missions. Other authors make similar assertions. In Our Mysterious Spaceship Moon (Dell, 1975), author Don Wilson publishes the following conversation between the Eagle crew and Mission Control, presumably picked up by ham radio operators during a broadcast interruption attributed by NASA to an "overheated camera":