View source for Planetary Classes

==Class A==
{{ImageBox2|file=gothos-tos-18.jpg|caption=[[Gothos]] ([[Star Trek|TOS]] [[The Squire of Gothos (Episode)|18]])}}
'''Geothermal<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|0-2 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|1,000-10,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere/Cold Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Partially molten
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Primarily hydrogen compounds
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Evolution
|style="width:75%"|Cools to become Class C
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|None
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Gothos]]
|}
<div style="clear:both;">&nbsp;</div>
==Class B==
'''Geomorteus<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|0-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|1,000-10,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Hot Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Partially molten, high surface temperature
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Extremely tenuous, few chemically active gases
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|None
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Mercury]]
|}
<div style="clear:both;">&nbsp;</div>
==Class C==
{{ImageBox2|file=psi2000-tos06.jpg|caption=Psi 2000 ([[Star Trek|TOS]]&nbsp;[[The Naked Time (Episode)|06]])}}
'''Geoinactive<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|2-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|1,000-10,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere/Cold Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Low surface temperature
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Frozen
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|None
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Pluto]], [[Psi 2000]]
|}
<div style="clear:both;">&nbsp;</div>

==Class D==
{{ImageBox2|file=moon-ent-96.jpg|caption=[[Moon (Sol IIIa)]] ([[Star Trek: Enterprise|ENT]] [[Demons (Episode)|96]])}}
'''Asteroid/Moon<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|2-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|100-1,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Hot Zone/Ecosphere/Cold Zone; found primarily in orbit of larger planets or in asteroid fields
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Barren and cratered
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|None or very tenuous
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|None
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Moon (Sol IIIa)]], [[Lunar V (Bajor VIIe)]]
|}
<div style="clear:both;">&nbsp;</div>
==Class E==
'''Geoplastic<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|0-2 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Molten, high surface temperature
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Hydrogen compounds and reactive gases
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Evolution
|style="width:75%"|Cools to become Class F
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Carbon cycle ([[Excalbians]])
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Excalbia]]
|}
<div style="clear:both;">&nbsp;</div>
==Class F==
'''Geometallic<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|1-3 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Volcanic eruptions due to molten core
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Hydrogen compounds
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Evolution
|style="width:75%"|Cools to become Class G
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Silicon-based ([[Horta]])
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Janus VI]]
|}
<div style="clear:both;">&nbsp;</div>
==Class G==
{{ImageBox2|file=delta_vega-tos-01.jpg|caption=[[Delta Vega (TOS)|Delta Vega]] ([[Star Trek|TOS]] [[Where No Man Has Gone Before (Episode)|01]])}}
'''Geocrystalline<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|3-4 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Still crystallizing
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Carbon dioxide, some toxic gases
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Evolution
|style="width:75%"|Cools to become Class K, L, M, N, O, or P
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Primitive single-celled organisms
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Delta Vega (TOS)|Delta Vega]]
|}
<div style="clear:both;">&nbsp;</div>
==Class H==
{{ImageBox2|file=rigel-12-tos03.jpg|caption=Rigel XII ([[Star Trek|TOS]] [[Mudd's Women (Episode)|03]])}}
'''Desert<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|4-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Hot Zone/Ecosphere/Cold Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Hot and arid, little or no surface water
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|May contain heavy gases and metal vapors
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Drought- and radiation-resistant plants, animal life
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Rigel XII]], [[Tau Cygna V]]
|}
<div style="clear:both;">&nbsp;</div>

==Class I==
'''Gas Supergiant<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|2-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|140,000-10 million km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Cold Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Tenuous, comprised of gaseous hydrogen and hydrogen compounds; radiates heat
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Zones vary in temperature, pressure, and composition; water vapor may be present
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Unknown
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Q'tahl]]
|}
<div style="clear:both;">&nbsp;</div>
==Class J==
{{ImageBox2|file=jupiter-dsc15.jpg|caption=[[Jupiter]] ([[Star Trek: Discovery|DSC]] [[Will You Take My Hand? (Episode)|15]])}}
'''Gas Giant<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|2-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|50,000-140,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Cold Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Tenuous, comprised of gaseous hydrogen and hydrogen compounds; radiates some heat
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Zones vary in temperature, pressure, and composition
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Hydrocarbon-based (Jovian)
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Jupiter]], [[Saturn]]
|}
<div style="clear:both;">&nbsp;</div>

==Class K==
{{ImageBox2|file=mars-stsc.jpg|caption=[[Mars]] ([[Star Trek: Star Charts (Book)|STSC]])}}
'''Adaptable<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|4-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|5,000-10,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Barren, little or no surface water
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Thin, mostly carbon dioxide
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Primitive single-celled organisms; adaptable for humanoid colonization through the use of pressure domes
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Mars]]
|}
<div style="clear:both;">&nbsp;</div>
==Class L==
'''Marginal<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|4-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Rocky and barren, little surface water
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Oxygen/argon, high concentration of carbon dioxide
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Limited to plant life; suitable for humanoid colonization
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Indri VIII]]
|}
<div style="clear:both;">&nbsp;</div>
==Class M==
See: [[:Category:Class M Planets|Class M Planets]]
{{Clear}}

==Class N==
'''Reducing<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|3-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|High surface temperature due to greenhouse effect; water exists only as vapor
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Extremely dense, carbon dioxide and sulfides
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Unknown
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Venus]]
|}
<div style="clear:both;">&nbsp;</div>
==Class O==
'''Pelagic<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|3-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Liquid water covers 80% or more of surface area
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Nitrogen, oxygen, trace elements
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Aquatic vegetation, animal life, humanoids
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Argo]]
|}
<div style="clear:both;">&nbsp;</div>
==Class P==
{{ImageBox2|file=psi2000-tos06.jpg|caption=[[Psi 2000]] ([[Star Trek|TOS]]&nbsp;[[The Naked Time (Episode)|06]])}}
'''Glaciated<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|3-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Ecosphere
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Water ice covers 80% or more of surface area
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Nitrogen, oxygen, trace elements
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Hardy vegetation, animal life, humanoids
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Exo III]]
|}
<div style="clear:both;">&nbsp;</div>
==Class Q==
'''Variable<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|2-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|4,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Hot Zone/Ecosphere/Cold Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Ranges from molten to water and/or carbon dioxide ice, due to eccentric orbit or variable output of star
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Ranges from tenuous to very dense
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Genesis Planet]]
|}
<div style="clear:both;">&nbsp;</div>
==Class R==
'''Rogue<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|2-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|4,000-15,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Interstellar space, cometary halos
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|May be temperate due to geothermal venting
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Primarily volcanic outgassing
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Non-photosynthetic plants, animal life
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Dakala]]
|}
<div style="clear:both;">&nbsp;</div>
==Classes S-T==
'''Ultragiant<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|2-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10-50 million km (Class S)<br/>
50-120 million km (Class T)
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Cold Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Tenuous, composed of gaseous hydrogen and hydrogen compounds; radiates considerable heat
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Zones vary in temperature, pressure, and composition; water vapor may be present
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Unknown
|}
<div style="clear:both;">&nbsp;</div>
==Class Y==
'''Demon<ref name="STSC" />'''
{|style="width:50%" align="left"
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Age
|style="width:75%"|2-10 billion years
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Diameter
|style="width:75%"|10,000-50,000km
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Location
|style="width:75%"|Hot Zone/Ecosphere/Cold Zone
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Surface
|style="width:75%"|Temperature can exceed 500&deg;K
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Atmosphere
|style="width:75%"|Turbulent, saturated with toxic chemicals and thermionic radiation
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Lifeforms
|style="width:75%"|Crystalline, Mimetic
|-
|class="HeaderRow ButtonLeftCorners" style="width:25%"|Example
|style="width:75%"|[[Tholia]], [[Demon Planet (Delta Quadrant)]]
|}
<div style="clear:both;">&nbsp;</div>

==References==
<references>
<ref name="STSC">[[Star Trek: Star Charts (Book)|''"Star Trek:'' Star Charts"]]. [[Star Trek (Miscellaneous)|''Star Trek'' (Miscellaneous)]]. Book. Simon &amp; Schuster/Pocket Books, October 2002.</ref>
<ref name="TOS00">[[The Cage (Episode)|"The Cage"]]. ''[[Star Trek]],'' episode 0. Television. Desilu Studios, 1965 (Unaired).</ref>
<ref name="ENT01">[[Broken Bow (Episode)|"Broken Bow"]]. ''[[Star Trek: Enterprise]],'' episodes 01-02. Television. Paramount Pictures Corporation, 26 September 2001.</ref>
</references>

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