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 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.	Molten, high temperature	Hydrogen compounds and reactive gases	File:Class E.jpg
Class F (Falor) (ex: Janus IV)	Geometallic Class F are planets at the most basic start of life. As volcanic activity starts to cool down and the crust solidifies, if a fluid medium such as water can form, life can as well. While still active and hostile to most humanoid life due to high levels of carbon dioxide and unstable surface temperatures, for a few minutes the air can be breathable. This class will normally only form in a system's temperate zone, else they remain Class E for the rest of their existence. As the planet cools further and becomes volcanically stable, they transition to Class G.	Volcanic	Hydrogen compounds	File:Class f.jpg
Class G (Galsh) (ex: Delta Vega)	Geocrystalline Class G planets are habitable. While volcanic activity is still sporadic, the cooler and older planet is able to sustain complex life. Algae and mosses start to form, along with soft animal life such as jellyfish. Oxygen is in abundance along with nitrogen and, while there wouldn't be food for them, humanoids can survive on these worlds indefinitely. They are rocky with developing oceans and seas but are silent worlds. Depending on state and position of the planet, a Class G can become a Class H, K, L, M, N, O or P world.	Crystallizing	Carbon dioxide, some toxic gases	File:Class g.JPG
Class H (Harauk) (ex: Vulcan)	Desert A Class H planet is almost entirely desert, at most they have only 20% of their surface covered in water. Young planets of four to six billion years old tend to be rocky while those that are older tend to be covered in sand. Life can evolve here but it is limited, plants tend to be small as do animals. Weather tends to be dry, sandstorms and still days with few clouds, some have snow on their poles and can experience wider variations of weather. They are often incapable of naturally supporting populations above a hundred million humanoid lifeforms.	Hot and arid, little or no water	May contain heavy gases and metal vapors	File:Class h.jpg
Class I (Ivek) (ex: Uranus)	Ice giant Class I planets are completely different from smaller molten core planets, their cores are mostly made of rock and ice. Layers of water, methane and ammonia make up the rest of the planetary body. They are large planets between 35Mn and 100Mn and tend to only form of the fringe of a solar system. They also tend to have very strong magnetic fields at each rotational pole.	Cores are mostly made of rock and ice	Layers of water, methane and ammonia	File:Class i.jpg
Class J (Jasif-ir) (ex: Jupiter)	Gas Giant If Class I are 'large' planets, Class J are 'giants'. At between 50Mm and 500Mm the largest of them are on the verge of becoming dwarf stars. Made up of liquid and gaseous hydrogen, their cores even made up of hydrogen compounds. Winds of over 600 kph lick the surface during storms making them extremely hazardous. Due to their size and gravitational pull, they often can form rings of matter that fall into their orbit. Forming in the medium to outer areas of a solar system, they tend to be closer to the star than a Class I planet.	Tenuous, comprised of gaseous hydrogen and hydrogen compounds, radiates some heat	Variable pressure and composition	File:Class j.jpg
Class K (Kesh) (ex: Mars)	Adaptable Class K planets are much like their Class H counterparts, but the atmosphere is too weak. Only capable of supporting single cell life they aren't very habitable and fluctuations in temperature would kill most humanoids over a few days. They can, however, be colonized with pressurized domes.	Barren, little or no water	Thin, mostly carbon dioxide	File:Class k.jpg
Class L (L’Nel)	Marginal Class L worlds are young planets that haven't yet developed animal life. They tend to be covered in forests and plants that are broken down by simple organisms and fungi. Water is not common and those with less than 20% surface coverage fall to being Class H. These planets, however, are perfect for colonization and terraforming. Impact of native life is minimal and minimum effort is needed.	Rocky and barren, little water	Oxygen/Argon, high concentration of carbon dioxide	File:Class l.JPG
Class M (Minshara) (ex: Earth)	Terrestrial Class M planets are perfect for most humanoid life, they are stable and can often evolve humanoid life and other complex animal life. The land masses are mostly rocky but covered in soil and vegetation, twenty to eighty percent of the planet is covered in water. The only other requirement is that is must have a breathable oxygen-nitrogen atmosphere and a temperate climate. Most species in the known universe originated from planets of this class. They are found in the ecosphere of a star that allows their development.	Water abundant	Nitrogen, Oxygen and trace elements	File:Class m.jpg
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	[[]]