Planetary means relating to a planet or planets. It can also refer to: Planetary (comics), a comic book series by Warren Ellis and John Cassaday Planetary habitability, the measure of an astronomical body's potential to develop and sustain life Planetary nebula, an astronomical object Epicyclic gearing (planetary gearing), an automotive transmission technology Planetary Radio, a public radio show about space exploration, produced by The Planetary Society The Planetary Society, the Earth's large… (More on Planetary)