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Class H

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Tau Cygna V

The class H-planet Tau Cygna V

In the Federation standard system of planetary classification, a class H planet was characterized as usually being uninhabitable by Humans. In the Treaty of Armens, "unwanted lifeforms inhabiting H class worlds may be removed at the discretion of the Sheliak Corporate." (TNG: "The Ensigns of Command")

An H class planet or moon could contain an atmosphere consisting of Oxygen and Argon. (VOY: "Scorpion, Part II")

Examples of a Class H planets:

Appendices

Background information

According to the Star Trek: Star Charts, on page 24, Class H worlds had an age of 4-10 billion years and had a diameter ranging from 8,000 to 15,000 km. They were found throughout a solar system. These desert planets were categorized by a hot and arid surface, with little or no surface water and an atmosphere that might contain heavy gasses and metal vapors. Lifeforms found on Class H planets included drought and radiation-resistant plantlife and similar animal life.

Because they are also arid planets, Ocampa, Nimbus III, Rigel XII and Ceti Alpha V (as of 2268) could also be H class planets, but they were never identified as such.

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