1-154-856 - NASA/Oxford Science Archive/Heritage Images

Jupiter and Io, one of its moons, 1979. This picture was taken by Voyager 1 from a distance of 20 million kilometres. Two Voyager spacecraft were launched in 1977 to explore the planets in the outer solar system. Voyager 1 flew past Jupiter at 278,000 kilometres in March 1979 before flying on to Saturn.