The Relationship Between Moons and Planets

Most of the moons in the solar system, some of them are as big as our moon. But you're saying that the ratio compared to their planet, most of them are small. And then there's the case, for example, of Pluto. Pluto has a moon, which is Sharon, which is one eighth of its mass. You could also argue that it's really like a dwarf planet binary system. Which one is the planet and which one is the moon? It all gets kind of fuzzy.