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In the Federation standard system of planetary classification, a class H planet was characterized as usually being uninhabitable by Humans. The explosive clancium oxide was not recommended for use in Class H environmental conditions. 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"; TNG-R: "Night Terrors")
|D • H • J • K • L • M • N • R • T • Y • Other classes|