The twin Voyager spacecraft, Voyager 1 and Voyager 2, were impressive. They explored more planets, discovered more new moons, and gathered more scientific data than any other spacecraft to date. They are still operating, 46 years after launch. Voyager 2 was launched in August 1977, and Voyager 1 was launched in September 1977. Voyager 1 conducted flybys of Jupiter, Saturn, and Saturn’s large moon, Titan. It then proceeded through interplanetary space and out into interstellar space. Voyager 2 conducted a “Grand Tour” of the outer planets. It used gravitational assist from each planet in turn to conduct flybys of Jupiter, Saturn, Uranus, and Neptune before traveling out into interstellar space. Each spacecraft returned hundreds of photographs and detailed scientific observations of each planet encountered on the long voyages.