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Class A - Geo-Thermal
Age:
0-2 billion years
Diameter:
1,000 - 10,000 km.
Location:
Ecosphere / Cold Zone
Surface:
Partially molten
Atmosphere:
Primarily hydrogen compounds
Evolution:
Cools to become Class C
Lifeforms:
None
Example:
Gothos
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Class B - Geo-Morteus
Age:
0-10 billion years
Diameter:
1,000 - 10,000 km.
Location:
Hot Zone
Surface:
Partially molten, high surface temperature
Atmosphere:
Extremely tenuous, few chemically active gases
Evolution:
-
Lifeforms:
None
Example:
Mercury
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Class C - Geo-Inactive
Age:
2-10 billion years
Diameter:
1,000 - 10,000 km.
Location:
Ecosphere / Cold Zone
Surface:
Low surface temperature
Atmosphere:
Frozen
Evolution:
-
Lifeforms:
None
Example:
Pluto, Psi 2000
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Class D - Asteroid/Moon
Age:
2-10 billion years
Diameter:
100 - 1,000 km.
Location:
Hot Zone / Ecosphere / Cold Zone; found primarily in orbit of larger planets or in asteroid fields
Surface:
Barren and cratered
Atmosphere:
None or very tenuous
Evolution:
-
Lifeforms:
None
Example:
Moon (Sol IIIa), Lunar V (Bajor VIIe)
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Class E - Geo-Plastic
Age:
0-2 billion years
Diameter:
10,000 - 15,000 km.
Location:
Ecosphere
Surface:
Molten, high surface temperature
Atmosphere:
Hydrogen compounds and reactive gases
Evolution:
Cools to become Class F
Lifeforms:
Carbon-cycle (Excalbian)
Example:
Excalbia
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Class F - Geo-Metallic
Age:
1-3 billion years
Diameter:
10,000 - 15,000 km.
Location:
Ecosphere
Surface:
Volcanic eruptions due to molten core
Atmosphere:
Hydrogen compounds
Evolution:
Cools to become Class G
Lifeforms:
Silicon-based (Horta)
Example:
Janus VI
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Class G - Geo-Crystalline
Age:
3-4 billion years
Diameter:
10,000 - 15,000 km.
Location:
Ecosphere
Surface:
Still crystallizing
Atmosphere:
Carbon dioxide, some toxic gases
Evolution:
Cools to become Class K, L, M, N, O, or P
Lifeforms:
Primitive single-celled organisms
Example:
Delta-Vega
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Class H - Desert
Age:
4-10 billions years
Diameter:
8,000 - 15,000 km.
Location:
Hot Zone / Ecosphere / Cold Zone
Surface:
Hot and arid, little or no surface water
Atmosphere:
May contain heavy gases and metal vapors
Evolution:
-
Lifeforms:
Drought and radiation-resistant plants, animal life
Example:
Rigel XII, Tau Cygna V, Ocampa, Nimbus III
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Class I - Gas Supergiant
Age:
2-10 billion years
Diameter:
140,000 - 10 million km.
Location:
Cold Zone
Surface:
Tenuous, comprised of gaseous hydrogen and helium compunds; radiates heat
Atmosphere:
Zones vary in temperature, pressure and composition; water vapor may be present
Evolution:
-
Lifeforms:
Unknown
Example:
Q'tahL
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Class J - Gas Giant
Age:
2-10 billion years
Diameter:
50,000 - 140,000 km.
Location:
Cold Zone
Surface:
Tenuous, comprised of gaseous hydrogen and helium compunds; radiates some heat
Atmosphere:
Zones vary in temperature, pressure and composition
Evolution:
-
Lifeforms:
Hydrocarbon-based (Jovian)
Example:
Jupiter, Saturn
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Class K - Adaptable
Age:
4-10 billion years
Diameter:
5,000 - 10,000 km.
Location:
Ecosphere
Surface:
Barren, little of no surface water
Atmosphere:
Thin, mostly carbon dioxide
Evolution:
-
Lifeforms:
Primitve single-celled organisms; adaptable for humanoid colonization through the use of pressure domes
Example:
Mars, Mudd
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Class L - Marginal
Age:
4-10 billion years
Diameter:
10,000 - 15,000 km.
Location:
Ecosphere
Surface:
Rocky and barren, little surface water
Atmosphere:
Oxygen/argon, high concentration of carbon dioxide
Evolution:
-
Lifeforms:
Limited to plant life; suitable for humanoid colonization
Example:
Indri VIII
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Class M - Terrestrial
Age:
3-10 billion years
Diameter:
10,000 - 15,000 km.
Location:
Ecosphere
Surface:
Surface water abundant; if water or ice covers more than 80% of surface, planet is considered Class O or Class P
Atmosphere:
Nitrogen, oxygen, trace elements
Evolution:
-
Lifeforms:
Extensive vegetation, animal life, humanoids
Example:
Earth, Vulcan, Cardassia Prime
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Class N - Reducing
Age:
3-10 billion years
Diameter:
10,000 - 15,000 km.
Location:
Ecosphere
Surface:
High surface temperature due to greenhouse effect; water exists only as vapor
Atmosphere:
Extremely dense, carbon dioxide and sulfides
Evolution:
-
Lifeforms:
Unknown
Example:
Venus
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Class O - Pelagic
Age:
3-10 billion years
Diameter:
10,000 - 15,000 km.
Location:
Ecosphere
Surface:
Liquid water covers 80% or more of surface area
Atmosphere:
Nitrogen, oxygen, trace elements
Evolution:
-
Lifeforms:
Aquatic vegetation, animal life, humanoids
Example:
Pacifica, Argo
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Class P - Glaciated
Age:
3-10 billion years
Diameter:
10,000 - 15,000 km.
Location:
Ecosphere
Surface:
Water ice covers 80% or more of surface area
Atmosphere:
Nitrogen, oxygen, trace elements
Evolution:
-
Lifeforms:
Hardy vegetation, animal life, humanoids
Example:
Andoria, Breen Homeworld, Exo III
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Class Q - Variable
Age:
2-10 billion years
Diameter:
4,000 - 15,000 km.
Location:
Hot Zone / Ecosphere / Cold Zone
Surface:
Ranges from molten to water and/or carbon dioxide ice, due to eccentric orbit or variable output of star
Atmosphere:
Ranges from tenuous to very dense
Evolution:
-
Lifeforms:
Unknown
Example:
Genesis Planet, Meridian
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Class R - Rogue
Age:
2-10 billion years
Diameter:
4,000 - 15,000 km.
Location:
Interstellar space, cometary halos
Surface:
May be temperate due to geothermal venting
Atmosphere:
Primarily volcanic outgassing
Evolution:
-
Lifeforms:
Non-photosynthetic plants, animal life
Example:
Dakala, The Founders' Homeworld
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Class S/T - Near Star
Age:
2-10 billion years
Diameter:
10-50 million km. (Class-S)
<br>
50-120 million km. (Class-T)
Location:
Cold Zone
Surface:
Tenuous, composed of gaseous hydrogen and helium compounds; radiates considerable heat
Atmosphere:
Zones vary in temperature, pressure and composition; water vapor may be present
Evolution:
-
Lifeforms:
Unknown
Example:
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Class Y - Demon
Age:
2-10 billion years
Diameter:
10,000 - 50,000 km.
Location:
Hot Zone / Ecosphere / Cold Zone
Surface:
Temperature can exceed 500K
Atmosphere:
Turbulent, saturated with toxic chemicals and thermionic radiation
Evolution:
-
Lifeforms:
Mimetic (Delta Quadrant)
Example:
Tholia
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