An atmosphere was a collection of gases that surrounded a celestial body with sufficient mass, and therefore enough gravity to hold it. Examples included planets, moons, and large asteroids. Almost all species in the galaxy needed some form of atmosphere to breathe.[source?] Humans, as well as most other species, naturally breathed oxygen.
As humans were the predominant species in the galaxy, a large number of planets within it possessed an atmosphere with a sufficient amount of oxygen.[source?]
Appearances[edit | edit source]
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- Atmosphere on Wikipedia