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! [[Class D]] |
! [[Class D]] |
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| − | | [[Planetoid]] or [[moon]]; |
+ | | [[Planetoid]] or [[moon]]; little to no atmosphere. Uninhabitable. |
| [[Regula]], [[Weytahn]] <!-- |
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! [[Class F planet|Class F]] |
! [[Class F planet|Class F]] |
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| − | | [[geology|geologically]] inactive and no [[atmosphere]] |
+ | | [[geology|geologically]] inactive and no [[atmosphere]]. |
| [[Janus VI]] |
| [[Janus VI]] |
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! [[Class H]] |
! [[Class H]] |
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| − | | Generally uninhabitable |
+ | | Generally uninhabitable. |
| [[Tau Cygna V]] <!-- Desert |
| [[Tau Cygna V]] <!-- Desert |
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| [[Nimbus III]] |
| [[Nimbus III]] |
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! [[Class L]] |
! [[Class L]] |
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| − | | Marginally habitable |
+ | | Marginally habitable. No animal life. Only vegetation life. |
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! [[Class M]] |
! [[Class M]] |
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| Terrestrial |
| Terrestrial |
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| − | | [[Earth]], [[Risa]], [[Bajor]] <!-- |
+ | | [[Earth]], {{dis|Vulcan|planet}}, [[Cardassia Prime]], [[Risa]], [[Bajor]] <!-- , [[Bajor]] [[Delta Vega]] |
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! [[Class Y planet|Class Y]] |
! [[Class Y planet|Class Y]] |
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| "Demon" |
| "Demon" |
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| − | | [[Silver Blood]] |
+ | | [[Class Y planet|Silver Blood planet]], [[Elba II]] |
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| − | | [[Thermionic radiation]] |
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Revision as of 11:13, 11 November 2015
Planetary classification systems were used by many races to categorize planets. Various factors were taken into consideration, including atmospheric composition, surface temperature, vegetation and size. The classification system used by the Federation used single-letter designations, for example class M to describe a planet able to support humanoid life for long periods, while the Vulcans used the term "Minshara class" to describe a similar planet.
Planetary classes
| Class | Description | Examples |
|---|---|---|
| Class D | Planetoid or moon; little to no atmosphere. Uninhabitable. | Regula, Weytahn |
| Class H | Generally uninhabitable. | Tau Cygna V |
| Class J | Gas giant | Jupiter, Saturn |
| Class K | Adaptable with pressure domes | Mudd, Theta VIII, Mars (class K transjovian) |
| Class L | Marginally habitable. No animal life. Only vegetation life. | Indri VIII |
| Class M | Terrestrial | Earth, Vulcan, Cardassia Prime, Risa, Bajor |
| Class N | Sulfuric | Venus |
| Class T | Gas giant | |
| Class Y | "Demon" | Silver Blood planet, Elba II |
Appendices
Background information
The Star Trek: Star Charts book, which was authored and advised by Trek staffers, listed many other planetary classes which may one day be recognized on-screen, but as of now they remain conjectural.
One such was "Class F", which was geologically inactive with no atmosphere. Janus VI was given as an example of this.
According to the Star Charts, a Class P planet is a "glaciated" planet. They have an age that ranges from three to ten billion years and a diameter between 10,000 to 15,000 kilometers. Class P planets are located in the ecosphere of a star system. A glaciated planet is categorized by a surface comprised of 80%+ water ice and an atmosphere consisting of nitrogen, oxygen and trace elements. Lifeforms found on class P planets include hardy vegetation, animal life, and occasionally native humanoids. It is widely believed that Breen is also a class P planet. However, according to Weyoun, it was in fact a lush world with a temperate climate, in which case it would have to be categorized as class M. (DS9: "When It Rains...")
Examples of class P planets: