To this day, we still don’t know much about Pluto. We’ve never sent a rover to explore it, even though it’s no longer considered a planet.
Even more interesting, Charon is not Pluto’s only moon. It’s one of five other moons and maybe more. And the way that Charon orbits Pluto makes it possibly a double planet.
To learn more about Pluto’s moon their sizes, check out Kurzgesagt’s latest Moonday series.