Class K planet

Class K Adaptable
Class K planets range in age from 4 to 10 billion years old. 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. Their atmospheres are thin, mostly carbon dioxide. Life forms, if any, are limited to single-celled organisms and algae. Class K planets are suitable for human colonization through terraforming.

Examples: Mars (Sol IV), Mudd, Son'a Prime