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Class K planets range in age from 4 to 10 billion years. Their diameters range in size from 5,000 to 10,000 km. They are located in the ecozone region of a star's solar system. They have rocky, barren surfaces with only trace amounts of water, and thin, mostly carbon dioxide atmospheres. Lifeforms, if any, are limited to single-celled organisms and algae. Class K planets are suitable for human colonization through terraforming. (Star Trek: Star Charts)