VOYAGER AND BEYOND
In March 1979, Voyager 1 flew past Jupiter, sending back thousands of high-resolution photos of the cloud tops as well as intriguingly detailed images of the moons
Callisto, Ganymede, Europa, and lo. Jupiter's gravity gave
Voyager 1 the velocity needed to reach its ultimate destination,
Saturn, in November 1980.
There, it discovered six new moons and returned spectacular pictures of the planet's rings.
Perhaps the most successful probe of all was Voyager 2, which flew past all four gas-giant planets. It reached Jupiter in July 1979, where it skimmed past the moons Callisto, Ganymede, Europa, and Amalthea, then went on to Saturn, traversing the planet's ring plane and passing closer to its moons than had Voyager 1. In January 1986, Voyager 2 reached Uranus, where it discovered several new moons. Finally, in August 1989, Voyager 2 made a close approach to Neptune, revealing an aqua-blue atmosphere punctuated by a huge dark spot and fleecy white cirrus clouds. It also discovered six new moons and four dark rings encircling the planet.