Planetary Classifications

Class (Vulcan Name)	Description	Surface	Atmosphere	Image
Class A (Ayhan) (ex: Gothos)	Geothermal Class A planets are small, normally less than 10,000 km in diameter and extremely geologically unstable. Because of this they tend to be quite young planets, normally only in their first billion years of existence. Due to volcanic activity they have high amounts of carbon dioxide in their atmosphere that keeps them extremely hot. When this activity stops the planets tend to become Class C planets. Even protected surface missions are not advised, there is no natural life of any sort.	Partially molten	Hydrogen compounds	File:Class A.jpg
Class B (Balev) (ex: Mercury)	Geomorteus Class B planets are small, normally less than 10,000 km in diameter and highly unsuited for humanoid life. They are normally quite close to the systems core with thin atmospheres of helium and sodium. Due to this make-up and the close distance to the sun or suns, they have mostly molten surfaces. During daylight, because of the thin atmosphere it can reach over five hundred degrees Kelvin, at night it can get as low as 73 Kelvin. With these extremes, life has never been known to evolve on these planets, however they have been known to occasionally have bacterial life on their surface from comet impacts.	Partially molten, high temperature	Extremely tenuous	File:Class B.jpg
Class C (Chu’lak) (ex: Pluto)	Geoinactive Almost all Class C planets start their lives as Class A planets and change once they stop being geologically active. Losing the atmosphere they had, they become completely barren, just a rock in space. Being more stable than Class A, they can be colonized with pressure domes and mined for resources. They are still normally less than 10,000 km in diameter and have limited gravity.	Low temperature	Frozen	File:Class c.jpg
Class D (Denak) (ex: Luna)	Asteroid/Moon Class E planets are the first stage of the development of a habitable planet. From core to crust they are molten but cooling. They can have a range of atmosphere but tend to have high levels of carbon dioxides, hydrogen and helium. Being larger than a Class B at between 1Mn and 1.5Mn they are more able to retain their atmosphere, while still having very high temperatures and being hazardous to almost all forms of life. If the planet starts to cool to the extend they develop a crust they become a Class F planet.	Barren and cratered	None or very tenuous	File:Class d.jpg
Class E (Evoras) (ex: Excalbia)	Geoplastic	Molten, high temperature	Hydrogen compounds and reactive gases
Class F (Falor) (ex: Janus IV)	Geometallic	Volcanic	Hydrogen compounds
Class G (Galsh) (ex: Delta Vega)	Geocrystalline	Crystallizing	Carbon dioxide, some toxic gases
Class H (Harauk) (ex: Vulcan)	Desert	Hot and arid, little or no water	May contain heavy gases and metal vapors
Class I (Ivek) (ex: Uranus)	Ice giant	Cores are mostly made of rock and ice	Layers of water, methane and ammonia
Class J (Jasif-ir) (ex: Jupiter)	Gas Giant	Tenuous, comprised of gaseous hydrogen and hydrogen compounds, radiates some heat	Variable pressure and composition
Class K (Kesh) (ex: Mars)	Adaptable	Barren, little or no water	Thin, mostly carbon dioxide
Class L (L’Nel)	Marginal	Rocky and barren, little water	Oxygen/Argon, high concentration of carbon dioxide
Class M (Minshara) (ex: Earth)	Terrestrial	Water abundant	Nitrogen, Oxygen and trace elements
Class N (Nesheh) (ex: Venus)	Reducing	High temperature	Extremely dense, carbon dioxide and sulfides
Class O (Ob'taree)	Pelagic	80%+ water	Nitrogen, Oxygen and trace elements
Class P (Paradaik) (ex: Breen)	Glaciated	80%+ water ice	Nitrogen, Oxygen and trace elements
Class Q (Qju'nirr) (ex: Genesis Planet)	Variable	Various	Tenuous to dense
Class R (Ri'a'gra)	Rogue	Maybe temperate due to geothermal venting	Primarily volcanic outgassing
Class S (Suk)	Hypergiant	Tenuous, comprised of gaseous hydrogen and hydrogen compounds, radiates considerable heat	Variable pressure and composition, may contain water vapor
Class T (Taurik)	Ultragiant	Tenuous, comprised of gaseous hydrogen and hydrogen compounds, radiates considerable heat	Variable pressure and composition, may contain water vapor
Class Y (Yehenik) (ex: Tholia)	Demon	500°K+	Turbulent, saturated with toxic chemicals and therionic radiation