A planet is a body orbiting a star or stellar remnant which is large enough to attain a round shape under its own gravity but which has failed to become large enough to ignite thermonuclear fusion and thus become a star in its own right. Planets are generally distinguished between gas giants and small, rocky terrestrial planets.
Game and Story Use
- A fantasy game featuring interplanetary travel might have large bodies which are comparable with planets in size, yet which are neither spherical nor otherwise fit the definition of gas giants or terrestrial planets.
- Terry Pratchett's Discworld is the most famous example in modern fiction.