Star Trek Expanded Universe

Class F planet

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Young planets, Class F Geometallic worlds range in age from 1 to 3 billion years old. Their diameters range in size from 10,000 to 15,000 km. They are located in the biozone region of a star's solar system. Their surfaces are actively volcanic. Their atmospheres primarily contain hydrogen compounds. Class F planets cool over time to evolve into Class G worlds. Life forms, if any, are silicon based. (Star Trek: Star Charts)

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