The Solar System consists of the Sun and the planets that orbit it.
In the Sailor Moon metaseries, the nine major planets of the Solar System are protected respectively by their own warriors known as the Sailor Senshi. In the Black Moon arc, a tenth planet known as Nemesis exists.
- Some people now consider there to be only eight planets as Pluto was declassified in 2006. This has caused jokes in the Sailor Moon fandom about Sailor Pluto and her existence.