Planets and Planetoids

Celestial bodies are a broad classification of objects that exist within a solar system. Though there are a number of different types of bodies, there are three major bodies that are considered most likely to bear an importance on the setting: A planet is a "is an astronomical object orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals" (source: wikipedia).

A planetoid, or minor planet, is an astronomical object in direct orbit around the Sun that is neither a dominant planet nor originally classified as a comet (source: wikipedia).

This page also descibes important moons, or natural satelites, which are described as a celestial body that orbits another body, e.g. a planet, which is called its primary (source: wikipedia).