Planet Classification
Class A
Type: Geo-Morteus Size: 100km - 1,000km Description: Usually found in a star's "hot zone." They have high surface temperatures due to the proximty to the star. Their atmospheres are extremely tenuous with few chemically active gases.
Class B
Type: Gas Giant Size: 50,000km - 140,000km Description: Usually found in a star's outer or "cold zone." They have high core temperatures, but do not radiate much heat. Low stellar radiation and high planet gravity enables them to keep a tenuous surface comprised of gaseous hydrogen and hydrogen compounds.
Class C
Type: Reducing Size: 10,000km - 15,000km Description: Usually found in a star's "habitable zone." They have high surface temperatures due to the "greenhouse effect" caused by their dense atmospheres. The only water found is in vapor form.
Class D
Type: Geo-Plastic Size: 10,000km - 15,000km Description: Usually have a molten surface because they have been recently formed. The atmosphere contains many hydrogen compounds and reactive gases. Class D planets eventually cool, becoming Class E.
Class E
Type: Geo-Metallic Size: 10,000km - 15,000km Description: Usually found in a star's "habitable zone." Their atmospheres still contain hydrogen compounds. They will cool further eventually becoming Class F.
Class F
Type: Geo-Crystaline Size: 10,000km - 15,000km Description: Usually found in a star's "habitable zone." They have surfaces that are still crystalizing. Their atmospheres still contain some toxic gases. They will cool eventually becoming Class C, M or N.
Class G
Type: Desert Size: 8,000km - 15,000km Description: Can be found in any of a star's zones. Their surfaces are usually hot and their atmospheres may contain heavy gases and metal vapors.
Class H
Class I
Type: Asteroid Size: 100km - 1,000km Description: Planetary bodies of this class can be found in any of a star's zones. They are usually found in orbit of larger planets or in asteriod fields. They have no atmospheres. Their surfaces are barren and cratered.
Class J
Type: Gas Supergiant Size: 140,000km - 10,000,000km Description: Usually found in a star's outer or "cold zone." They have high core temperatures causing them to radiate heat. Low stellar radiation and high planet gravity enables them to keep a tenuous surface comprised of gaseous hydrogen and hydrogen compounds.
Class K
Type: Adaptable Size: 5,000km - 10,000km Description: Usually found in a star's "habitable zone." They are adaptable for humanoid colonization through the use of pressure domes and other life support devices. They have thin atmospheres. Small amounts of water are present.
Class L
Type: Geo-Inactive Size: 1,000km - 10,000km Description: Usually found in a star's "habitable zone" or "cold zone." Low solar radiation and minimal internal heat usually result in a frozen atmosphere.
Class M
Type: Terrestrial Size: 10,000km - 15,000km Description: Found in a star's "habitable zone." They have atmospheres that contain oxygen and nitrogen. Water and life-forms are typically abundant. If water covers more than 97% of the surface, then they are considered class N.
Class N
Type: Pelagic Size: 10,000km - 15,000km Description: Usually found in a star's "habitable zone." They have atmospheres that contain oxygen and nitrogen. Water and life-forms are typically abundant. If water covers less than 97% of the surface, then they are considered class M.
Class S
Type: Near Star Size: 50,000,000km - 120,000,000km Description: Usually found in a star's "cold zone." They have high core temperatures causing them to radiate heat and light. These are the largest possible planets, because most planetary bodies that reach this size do become stars.
Class T
Type: Ultra Giant Size: 10,000,000km - 50,000,000km Description: Usually found in a star's "cold zone." They have high core temperatures causing them to radiate enough heat to keep water in a liquid state.
Class Y
Type: Demon Size: 10,000km - 15,000km Description: Demon Planets and planetoids of this class can be found in any of a star's zones. Atmospheric conditions are often turbulent and saturated with poisonous chemicals and thermionic radiation. Surface temperatures can reach in excess of 500 K. Communication is frequently impossible, and transport may be difficult. Simply entering orbit is a dangerous prospect. No known environment is less hospitable to humanoid life than a Class Y planetary body.
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