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Planetary Classes

A B C D E F G H I J K L M N O P Q R S T Y
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Class A - Geothermal
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 a Class C
Life-Forms: None
Examples: Gothos
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Class B - Geomorteus
Age: 0 - 10 Billion years
Diameter: 1,000 - 10,000 km
Location: Hot Zone
Surface: Partially molten, high surface temperature
Atmosphere: Extremely tenous, few chemically active gasses
Life-Forms: None
Examples: Mercury
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Class C - Geoinactive
Age: 2 - 10 Billion years
Diameter: 1,000 - 10,000 km
Location: Ecosphere - Cold Zone
Surface: Low surface temperature
Atmosphere: Frozen
Life-Forms: None
Examples: Pluto, PSI 2000
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Class D - Astroid / Moon
Age: 2 - 10 Billion yrs
Diameter: 100 - 1,000 km
Location: Hot Zone / Ecosphere / Cold Zone; found primarily in orbit of larger planets or in astroid fields
Surface: Barren and cratered
Atmosphere: None or very tenuous
Life-Forms: None
Examples: Moon (Sol IIIa), Lunar V (Bajor VIIe)
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Class E - Geoplastic
Age: 0 - 2 Billion yrs
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
Life-Forms: Carbon-cycle (Excalbian)
Examples: Excalbia
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Class F - Geometallic
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
Life-Forms: Silicon-based (Horta)
Examples: Janus IV
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Class G - Geocrystalline
Age: 3 - 4 Billion years
Diameter: 10,000 - 15,000
Location: Ecosphere
Surface: Still crystallizing
Atmosphere: Carbon dioxide, some toxic gases
Evolution Cools to become Class - K, L, M, N, O, or P
Life-Forms: Primitive single-celled organisms
Examples: Delta Vega
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Class H - Desert
Age: 4 - 10 Billion yrs
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 vapor
Life-Forms: Drought- and radiation-resistant planets, animal life
Examples: Rigel XII, Tau Cygna V
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Class I - Gass Supergiant
Age: 2 - 10 Billion years
Diameter: 140,000 - 10 million km
Location: Cold Zone
Surface: Tenuous, comprised of gaseous hydrogen and hydrogen compounds; radiates heat
Atmosphere: Zones vary in temperature, pressure and composition; water vapor may be present
Life-Forms: Unknown
Examples: Q`thal
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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 hydrogen compounds; radiates some heat
Atmosphere: Zone vary in temperature, pressure and composition
Life-Forms: Hydrocarbon-based (Jovian)
Examples: 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 or no surface water
Atmosphere: Thin, mostly carbon dioxide
Life-Forms: Primitive single-celled organisms; adaptable for humanoid colonization through the use of pressure domes
Examples: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
Life-Forms: Limited to plant life; suitable for humanoid colonization
Examples: 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
Life-Forms: Extensive vegetation, animal life, humanoids
Examples: Earth, Vulcan, Cardassia Prime, Bajor
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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
Life-Forms: Unkown
Examples: 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
Life-Forms: Aquatic vegetation, animal life, humanoids
Examples: 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
Life-Forms: Hardy vegetation, animal life, humanoids
Examples: 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
Life-Forms: None
Examples: Genesis
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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
Life-Forms: Non-photosynthetic plants, animal life
Examples: Dakala
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Class S - Ultragiant I
Age: 2 - 10 Billion years
Diameter: 10 - 50 million km
Location: Cold Zone
Surface: Tenuous, composed of gaseous hydrogen and hydrogen compounds; radiates considerable heat
Atmosphere: Zones vary in temperature, pressure and composition; water vapor may be present
Life-Forms: Unknown
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Class T - Ultragiant II
Age: 2 - 10 Billion years
Diameter: 50 - 120 million km
Location: Cold Zone
Surface: Tenuous, composed of gaseous hydrogen and hydrogen compounds; radiates considerable heat
Atmosphere: Zones vary in temperature, pressure and composition; water vapor may be present
Life-Forms: Unknown
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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 degrees
Atmosphere: Turbulent, saturated with toxic chemicals and thermionic radiation
Life-Forms: Mimetic (Delta Quadrant)

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