Memory Alpha
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Memory Alpha

Class G was a planetary classification for a type of planet.

T'Khut was a class G planet. (SNW: "Charades")

The Star Trek: Star Charts (p. 24) defined class G "geocrystalline" as a terrestrial planet between three and four billion years old, with a primarily carbon dioxide atmosphere, that will eventually cool into a class K, L, M, N, O, or P. Delta Vega was an example of such a planet.

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