Oxygen

Oxygen was a gas that Humans and other species breathed to survive. Planets with an appropriate level of oxygen in their atmosphere included Naboo, Tatooine, and Coruscant, among many others.

Appearances

 * Star Wars Episode I: The Phantom Menace
 * Star Wars Episode II: Attack of the Clones
 * Star Wars Episode III: Revenge of the Sith
 * Star Wars Episode IV: A New Hope
 * Star Wars Episode V: The Empire Strikes Back
 * Star Wars Episode VI: Return of the Jedi