Planetary Classes

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Class A

Geothermal[1]

Age 0-2 billion years
Diameter 1,000-10,000km
Location Ecosphere/Cold Zone
Surface Partially molten
Atmosphere Primarily hydrogen compounds
Evolution Cools to become Class C
Lifeforms None
Example Gothos
 

Class B

Geomorteus[1]

Age 0-10 billion years
Diameter 1,000-10,000km
Location Hot Zone
Surface Partially molten, high surface temperature
Atmosphere Extremely tenuous, few chemically active gases
Lifeforms None
Example Mercury
 

Class C

Geoinactive[1]

Age 2-10 billion years
Diameter 1,000-10,000km
Location Ecosphere/Cold Zone
Surface Low surface temperature
Atmosphere Frozen
Lifeforms None
Example Pluto, Psi 2000
 

Class D

Asteroid/Moon[1]

Age 2-10 billion years
Diameter 100-1,000km
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
Lifeforms None
Example Moon (Sol IIIa), Lunar V (Bajor VIIe)
 

Class E

Geoplastic[1]

Age 0-2 billion years
Diameter 10,000-15,000km
Location Ecosphere
Surface Molten, high surface temperature
Atmosphere Hydrogen compounds and reactive gases
Evolution Cools to become Class F
Lifeforms Carbon cycle (Excalbians)
Example Excalbia
 

Class F

Geometallic[1]

Age 1-3 billion years
Diameter 10,000-15,000km
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
 

Class G

Geocrystalline[1]

Age 3-4 billion years
Diameter 10,000-15,000km
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
 

Class H

Desert[1]

Age 4-10 billion years
Diameter 10,000-15,000km
Location Hot Zone/Ecosphere/Cold Zone
Surface Hot and arid, little or no surface water
Atmosphere May contain heavy gases and metal vapors
Lifeforms Drought- and radiation-resistant plants, animal life
Example Rigel XII, Tau Cygna V
 

Class I

Gas Supergiant[1]

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
Lifeforms Unknown
Example Q'tahl
 

Class J

Gas Giant[1]

Age 2-10 billion years
Diameter 50,000-140,000km
Location Cold Zone
Surface Tenuous, comprised of gaseous hydrogen and hydrogen compounds; radiates some heat
Atmosphere Zones vary in temperature, pressure, and composition
Lifeforms Hydrocarbon-based (Jovian)
Example Jupiter, Saturn
 

Class K

Adaptable[1]

Age 4-10 billion years
Diameter 5,000-10,000km
Location Ecosphere
Surface Barren, little or no surface water
Atmosphere Thin, mostly carbon dioxide
Lifeforms Primitive single-celled organisms; adaptable for humanoid colonization through the use of pressure domes
Example Mars
 

Class L

Marginal[1]

Age 4-10 billion years
Diameter 10,000-15,000km
Location Ecosphere
Surface Rocky and barren, little surface water
Atmosphere Oxygen/argon, high concentration of carbon dioxide
Lifeforms Limited to plant life; suitable for humanoid colonization
Example Indri VIII
 

Class M

Terrestrial / Minshara class[1][2][3]

Age 3-10 billion years
Diameter 10,000-15,000km
Location Ecosphere
Surface Surface water abundant; if water or ice covers more than 80% of surface, planet is considered Class O or P
Atmosphere Nitrogen, oxygen, trace elements
Lifeforms Extensive vegetation, animal life, humanoids
Example Earth, Vulcan
 

Class N

Reducing[1]

Age 3-10 billion years
Diameter 10,000-15,000km
Location Ecosphere
Surface High surface temperature due to greenhouse effect; water exists only as vapor
Atmosphere Extremely dense, carbon dioxide and sulfides
Lifeforms Unknown
Example Venus
 

Class O

Pelagic[1]

Age 3-10 billion years
Diameter 10,000-15,000km
Location Ecosphere
Surface Liquid water covers 80% or more of surface area
Atmosphere Nitrogen, oxygen, trace elements
Lifeforms Aquatic vegetation, animal life, humanoids
Example Argo
 

Class P

Glaciated[1]

Age 3-10 billion years
Diameter 10,000-15,000km
Location Ecosphere
Surface Water ice covers 80% or more of surface area
Atmosphere Nitrogen, oxygen, trace elements
Lifeforms Hardy vegetation, animal life, humanoids
Example Exo III
 

Class Q

Variable[1]

Age 2-10 billion years
Diameter 4,000-15,000km
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
Example Genesis Planet
 

Class R

Rogue[1]

Age 2-10 billion years
Diameter 4,000-15,000km
Location Interstellar space, cometary halos
Surface May be temperate due to geothermal venting
Atmosphere Primarily volcanic outgassing
Lifeforms Non-photosynthetic plants, animal life
Example Dakala
 

Classes S-T

Ultragiant[1]

Age 2-10 billion years
Diameter 10-50 million km (Class S)

50-120 million km (Class T)

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
Lifeforms Unknown
 

Class Y

Demon[1]

Age 2-10 billion years
Diameter 10,000-50,000km
Location Hot Zone/Ecosphere/Cold Zone
Surface Temperature can exceed 500°K
Atmosphere Turbulent, saturated with toxic chemicals and thermionic radiation
Lifeforms Crystalline, Mimetic
Example Tholia, Demon Planet (Delta Quadrant)
 

References

  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 "Star Trek: Star Charts". Star Trek (Miscellaneous). Book. Simon & Schuster/Pocket Books, October 2002.
  2. "The Cage". Star Trek, episode 0. Television. Desilu Studios, 1965 (Unaired).
  3. "Broken Bow". Star Trek: Enterprise, episodes 01-02. Television. Paramount Pictures Corporation, 26 September 2001.