Star Trek Expanded Universe

Class P Glaciated planets range in age from 3 to 10 billion years old. Their diameters range in size from 10,000 to 15,000 km. They are usually located on the extreme edge of the ecozone region of a star's solar system. Class P worlds have an extreme abundance of water, but much of it is frozen in ice, covering more than 80% of the surface. They have Class M-like atmospheres, with oxygen, nitrogen, and other trace elements. There is usually hardy plant and animal life surviving in the tundra. (Star Trek: Star Charts)

Class P planets[]

External link[]

Class P article at Memory Beta, the non-canon Star Trek wiki.