Oxygen is a form of matter, a chemical element. Oxygen is vital for the survival of many carbon-based lifeforms, including Humans and other humanoids.

Oxygen is commonly found in the form of gas in the atmosphere of many class M planets across the galaxy, although at fairly low levels. It is also found in atmospheres of class L, class O and class P planets, making all capable of supporting most humanoid lifeforms. (ST reference: Star Charts)

Hydrogen readout
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