1-154-857 - NASA/Oxford Science Archive/Heritage Images

Full view of Io, one of the moons of Jupiter, 1979. Taken from the Voyager 1, this moon was named the pizza moon because of its mottled appearance. Io is highly volcanic and this picture was taken from a distance of 862,000 kilometres. Two Voyager spacecraft were launched in 1977 to explore the planets in the outer solar system. Both flew past Jupiter in 1979 before flying on to Saturn.