 | Class A - Geothermal |  |
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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
Life-forms: None
Example: Gothos
Source: Star Trek Star Charts |
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| Class B - Geomorteus | |
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|
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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
Life-forms: None
Example: Mercury (Sol I)
Source: Star Trek Star Charts |
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| Class C - Geoinactive | |
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Age: 2-10 billion years
Diameter: 1,000-10,000 km
Location: Ecosphere/Cold Zone
Surface: Low surface temperature
Atmosphere: Frozen
Life-forms: None
Example: Pluto (Sol IX)
Source: Star Trek Star Charts |
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| Class D - Asteroid/Moon | |
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|
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 Age: 2-10 billion years
Diameter: 100-1,000 km
Location: Any zone; primarily in orbit of larger planets or in asteroid fields
Surface: Barren and cratered
Atmosphere: None or very tenuous
Life-forms: None
Examples: Moon/Luna (Sol IIIa), Lunar V (Bajor VIIe), Regula
Source: ST2: The Wrath of Khan, VOY: Emanations, Star Trek Star Charts |
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| Class E - Geoplastic | |
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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
Life-forms: Carbon-cycle (Excalbian)
Example: Excalbia
Source: Star Trek Star Charts |
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| Class F - Geometallic | |
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|
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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)
Example: Janus IV
Source: Star Trek Star Charts |
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| Class G - Geocrystalline | |
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Age: 3-4 billion years
Diameter: 10,000-15,000 km
Location: Ecosphere
Surface: Still crystallizing
Atmosphere: Carbon diozide, some toxic gases
Evolution: Cools to become Class K, L, M, N, O, or P
Life-forms: Primitive single-celled organisms
Example: Delta Vega
Source: Star Trek Star Charts |
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| Class H - Desert | |
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Age: 4-10 billion years
Diameter: 8,000-15,000 km
Location: Any zone
Surface: Hot and arid, litte or no surface water
Atmosphere: May contain heavy gases and metal vapors
Life-forms: Drought- and rediation-resistant plants, animal life
Examples: Rigel XII, Tau Cygna V, Ocampa, Nimbus III
Source: TNG: The Ensigns of Command, Star Trek Star Charts |
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| Class I - Gas Supergiant | |
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|
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Age: 2-10 billion years
Diameter: 140,000-10 million km
Location: Cold Zone
Surface: Tenuous, comprosed of gaseous hydrogen and hydrogen compounds; radiates heat
Atmosphere: Zones vary in temperature, pressure and composition; water vapor may be present
Life-forms: Unknown
Example: n/a
Other names: Class 9 (Starfleet, 2155), Q'tahL-class (Klingon, 2155)
Source: ENT: Sleeping Dogs, Star Trek Star Charts |
| |
| Class J - Gas Giant | |
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|
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 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: Zones vary in temperature, pressure and composition
Life-forms: Hydrocarbon-based
Example: Jupiter (Sol V), Saturn (Sol VI)
Source: DS9: Starship Down, Star Trek Star Charts |
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| Class K - Adaptable | |
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|
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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: Primarily single-celled organisms; adaptable for humanoid colonization by using pressure domes
Examples: Mars (Sol IV), Mudd, Theta 116 VIII (Transjovian subtype)
Source: TOS: I, Mudd; TNG: The Royale; Star Trek Star Charts |
| |
| Class L - Marginal | |
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|
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 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
Example: Indi VIII
Source: TNG: The Chase; Star Trek Star Charts |
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| Class M - Terrestrial | |
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|
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 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 the surface, the planet is considered Class O or Class P
Atmosphere: Nitrogen, oxygen, trace elements
Life-forms: Extensive vegetation, animal life, humanoids
Example: Earth, Vulcan, Cardassia Prime, Bajor, Qo'noS, Romulus
Other names: Minshara class (Vulcan, mid-22nd century)
Source: Various episodes; Star Trek Star Charts |
| |
| Class N - Reducing | |
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|
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Age:
Diameter:
Location:
Surface:
Atmosphere:
Evolution:
Life-forms:
Example:
Source: |
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| Class O - Pelagic | |
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|
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Age:
Diameter:
Location:
Surface:
Atmosphere:
Evolution:
Life-forms:
Example:
Source: |
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| Class P - Glaciated | |
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|
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Age:
Diameter:
Location:
Surface:
Atmosphere:
Evolution:
Life-forms:
Example:
Source: |
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| Class Q - Variable | |
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|
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Age:
Diameter:
Location:
Surface:
Atmosphere:
Evolution:
Life-forms:
Example:
Source: |
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| Class R - Rogue | |
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|
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Age:
Diameter:
Location:
Surface:
Atmosphere:
Evolution:
Life-forms:
Example:
Source: |
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| Class S-T - Ultragiant | |
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|
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Age:
Diameter:
Location:
Surface:
Atmosphere:
Evolution:
Life-forms:
Example:
Source: |
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| Class Y - 'Demon' | |
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|
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Age:
Diameter:
Location:
Surface:
Atmosphere:
Evolution:
Life-forms:
Example:
Source: |
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| Notes | |
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|
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| A planetary classification is only canon if it lists a canon source (TV episode or movie), otherwise the source is the book Star Trek Star Charts by Geoffrey Mandel |
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