Amalthea - one of Jupiter's Moons. Three views of Amalthea, photographed by Voyager 1. The two Voyager spacecraft were launched in 1977 explore the planets in the outer solar system. Voyager 1 made its closest approach Jupiter of 278,000 km in March 1979 before flying on Saturn (NASA Media Archives). Buy this as a superb wall poster, a canvas print or a framed print.