Launched in 1977, the unmanned space probes Voyager 1 and 2 carried out an extensive survey of the planets and moons of the outer solar system. Visiting Jupiter, Saturn, Uranus, and Neptune, the Voyager program can only be called an unqualified success on virtually every level. The twin spacecraft returned thousands of photographs and reams of scientific data that fundamentally changed our understanding of our entire solar system. Currently in interstellar space, Voyager 1 is the farthest ma