Planetary

1. Planetary is an adjective meaning relating to a planet or planets.
2. A planetary nebula is an astronomical object that appears nebulous and disk-like in low-resolution observations. The name is due to a resemblance to planets, not a similarity to them.
3. Planetary gearing is a gear system also known as epicyclic gearing.
4. Planetary is a comic book series by Warren Ellis and John Cassaday.