Some planets in Spore are orbited by a moon. They are usually found right next to a gas giant, but are also located at your homeworld as well as a few other random planets. Other than the fact that the moons are orbiting another planet and have less land for colonies, they are the same as a regular planet.
In the 2006 E3 video Will Wright pulls his UFO up to an inhabited Moon that was obviously orbiting a large gas giant-type planet. It is later revealed that the moon was a colony of an alien civilization called Greevils.
- On moons orbiting gas giants, at certain times of the day, the gas giant covers most of the sky and blocks out the sun, creating an artificial night.
- Your homeworld will always have a T-0 moon. The gas giant in your Solar System will not, however many other gas giants do.
- Destroying a planet with a Planet Buster will also destroy its moon, but destroying a moon will not destroy the planet.
- Occasionally, the planets and moons may line up, occult, make transitions around the home star or binary, and even undergo a solar eclipse.
- The game does not appear to differentiate planets from moons; they are all referred to as planets.
- Moons with a T-score of 1 are rare, and moons with a T-score of 2 or 3 are practically nonexistent unless terraformed by the player.
- Empire homeworlds can apparently never be moons, unless uplifted by a Monolith.