Class L

From Hidden Frontier

In planetary classification, some barely habitable planets and moons are classified as Class L. They have an age of between 4-10 billion years and a diameter between 10,000 and 15,000 kilometers. They are categorized by a rocky and barren surface with little surface water and an atmosphere of oxygen/argon with a high concentration of carbon dioxide. Native lifeforms are limited to plant life, although the majority of Class L planets are suitable for humanoid colonization, particularly through the use of terraforming.