Planet Classification

CLASS D – These planets are small rocky planetoids. These planets are completely void of atmosphere or natural life of any form. Ceres is a planetoid within the asteroid fields of Sol and is considered a Class D planet. These planetoids are not stable enough to build anything on.

CLASS F – Very similar to Class D. Like a class D, the planet is void of atmosphere and water, but class F planets are considerably larger in size, older, and more solid in form. It is possible to build habitats and structures. Mercury is considered a Class F planet.

CLASS G – This is a very low gravity planet. The planet has an inhospitable atmosphere. There are patches of water and ice, ammonia and other similar gases. Rarely will life ever be found on class G planets however, under kilometers of frozen ice and gases, some oceans have formed and in a few instances, life has evolved from there.

CLASS H -- Class H planets are extremely dry and inhospitable. If there is an atmosphere on the planet, they tend to be turbulent and very thin. Life can live on class H planet, only if they provide their own atmosphere and temperature control. Mars was once considered a class H planet, prior to being terraformed.

CLASS J – These planets are one of the most common and largest of all planets. There are three classes including Jovien (like Jupiter), sub-jovien (like Uranus), or super-jovien (like brown giants) class planets. These gas giants tend to be so large, that they rival some smaller stars. They cannot hold life in any form.

CLASS K – those similar in gravity to that of a class M (Earth type planet), they lack the temperatures and/or atmospheres to sustain life. In order to settle a class K planet, terraforming on a massive scale or building self sustaining atmosphere and temperature control are essential to survive.

CLASS L – these planets are small, rocky planets with oxygenated atmospheres. However, nitrogen is missing in the atmosphere and therefore animal life can never form as a result. Vegetation may exist in many levels. Some plant bases civilizations have developed, though in rare instances.

CLASS M – generally small and rocky planets, class M planets are life bearing with heavily oxygenated and nitrogen based atmospheres. Class M planets can vary is temperature, gravitational densities, atmospheric levels, and size of planets. 85% of all known civilizations are come from Class M planets. CLASS M planets come in several sub-categories.

• CLASS M(O) – these planets are ocean based. More than 90% of this surface of the planet is covered in oceans. Civilizations that come from this planet, generally are gill based and live underwater.
• CLASS M(J) – these planets are primarily jungle based. Hotter and humid, these planets have heavy atmospheres and higher levels of oxygen. It is not unusual to find plant and animal based civilizations on class M(j) planets.
• CLASS M(D) – very dry planet with very few oceans. The atmosphere is without much humidity and very dry. The planet are primarily desert based.
• CLASS M(T) – A very diverse planet, Earth is in this category. There are very temperate and has no primary style of environment.
• CLASS M(A) – Much colder and frigid, these planets are primarily arctic in environment. Snow and ice cover 60% of the planet.

CLASS T – These classes of planets are a sub-class of Class J planets and are known for have large orbital ring systems. Though most gas giants have rings around them in the Sol system, Saturn is the only one that is classified as Class T.

CLASS Y – These are considered ‘Demon class'. These planets are very high in temperature, very corrisive atmospheres and very high levels of radiation. However, despite the very harsh conditions, life does exist on a few.