Although Pluto has been downgraded to a "dwarf planet," it boasts more moons than Mercury, Earth, Venus and Mars combined. (Take that, smug inner planets.) Last year, its two newly discovered moons were named Kereberos and Styx — which, like their companions, take their monikers from the underworld of ancient mythology.

As this video by Kurzgesagt illustrates, the satellites don't orbit Pluto itself — instead, they move around a center of mass outside of the planet.