In this graphic we can see the
comparative sizes of the larger moons of the Solar System. Triton is seventh in order of diameter. And it looks pretty small compared to Ganymede and Titan. One of the interesting things here is that it shows something about an object that's not on the graphic: dwarf planet Pluto. That's because we know that its cousin Triton is slightly larger, so it means that there are seven Solar System moons that are bigger than Pluto.