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The Class M planet Earth.

Class M is a fictional classification for planets in the Star Trek science fiction franchise. In the Star Trek: Enterprise series, T'Pol (Jolene Blalock) uses the Vulcan term Minshara class.

Their atmospheres comprise nitrogen and oxygen and have an abundance of liquid water necessary for carbon-based life to exist. Extensive plant and animal life often flourishes; often, a sentient race is also present. Earth is a textbook example of a Class M world; other Class M planets that appear throughout the franchise include Vulcan, Cardassia Prime, Bajor, Betazed, Romulus, and Qo'noS.[1][2][3]

In fiction, Class M planets are similar to those suggested to be found in the real-world astronomical theory of life supporting planets found within the habitable zone (HZ), sometimes also referred to as the 'Goldilocks' zone.

Contents

Other planet classifications

Class A, B and C 
Typically small, young planets whose class depends on their age and solidity of their cores.[4]
Class D 
Class D objects are planetoids like asteroids and some moons. Regula, the site of the underground second stage of the Genesis experiment in Star Trek II: The Wrath of Khan, is a Class D planetoid. The USS Voyager also encountered a Class D planet in the Delta Quadrant in the Star Trek: Voyager episode "Gravity".[3][5]
Class E, F and G 
Typically, Proto-Earth-sized planets whose class depends on their age and solidity of their cores.[4]
Class H 
Class H planets appear in the series as harsh desert worlds. The planet Tau Cygna V visited by the USS Enterprise-D in the Star Trek: The Next Generation episode "The Ensigns of Command" was designated as a Class H world.[3][6]
Class I 
Class of gas giant, larger than Class J, and smaller than Class S and T.[4]
Class J and Class T 
Class J and Class T planets are gas giants. Class J are smaller than Class T which are considered "super", or "ultra", gas giants. In the Star Trek: Deep Space Nine episode "Starship Down", the USS Defiant enters the atmosphere of a Class J gas giant to rescue the crew of a Karemman ship attacked by the Jem'Hadar. The USS Voyager encounters a Class T Super-Giant in the Delta Quadrant with "radiogenic" rings in the Voyager episode "Good Shepherd".[3][7]
Class K 
Class K planets are barren worlds with no native life. However, through terraforming, they can be made into Class M worlds. In the original Star Trek series episode "I, Mudd", the planet Mudd was designated in dialogue as Class K.[3][8]
Class L 
Class L planets are barely habitable worlds with primitive ecosystems. In the "The Chase", the planet Indri VIII is indicated in dialogue as Class L. In "The 37s", the planet on which Amelia Earhart and others are stranded is a Class L planet with an oxygen-argon atmosphere. In "Muse", the planet on which B'Elanna Torres' shuttle crash lands is described as a Class L planet, which also supports Bronze Age humanoid life. In "The Ascent", Quark and Odo crash-land on a desolate Class L planet.[3][9]
Class N 
Class N planets have a reducing environment and are barren and rocky with extremely high surface temperatures caused by thick atmospheres containing carbon dioxide and corrosive sulfides. In "Night Terrors", Class N environments were mentioned as the ideal places to use oxidizer-free explosives. The Tholian are said to have come from an N Class planets in Star Trek: The Lost Era book The Sundred.[10] The game Star Trek: The Next Generation - A Final Unity mentions that Class N planets are more related to Class M with the key difference being a higher ratio of water to land.
Class O and P 
Planets covered almost completely with water (class O), or water-ice (Class P).[4]
Class Q 
Planets with continually changing environments caused by peculiar orbits, an orbit around a variable output star, or some other factor which causes conditions to drastically change over time.[4]
Class R 
A rogue planetary body which is one that does not orbit a star but drifts freely in space.[4]
Class S 
Class of gas giant smaller than Class T and the next larger size up from Class I.[4]
Class Y 
Class Y planets are referred to as "Demon" worlds, where surface conditions do not fall into any other recognized category. Such worlds are usually hostile and lethal to humanoid life. If life develops on these worlds they usually take on many bizarre forms, like living crystal or rock, liquid or gaseous physical states, or incorporeal, dimensional, or energy-based states. In the series, examples of Class Y "Demon" planets include Tholia, the "Silver Blood" planet discovered by the USS Voyager in the Delta Quadrant in the episode "Demon" and later mentioned in "Course: Oblivion", and the home world of the incorporeal Medusans.[10][11]
Class X and Z 
Reserved for other designations of "demon" planets.[4]

See also

  • List of Star Trek planets: A-B
  • List of Star Trek planets: C-F
  • List of Star Trek planets: G-L
  • List of Star Trek planets: M-Q
  • List of Star Trek planets: R-S
  • List of Star Trek planets: T-Z

References

  1. ^ Erdmann, Terry J.; Paula M. Block (2008). Star Trek 101. Simon and Schuster. pp. 21. ISBN 0743497236. "What is Class M? It is a designation used to describe a planet capable of supporting life "as we know it". With a breathable oxygen-nitrogen atmosphere and a temperature range that won't boil the crew's blood. Most of the planets the Enterprise stops at fit the classification and are very Earth-like. Which is very convenient for filming on location."  
  2. ^ Mandel, Geoffrey (2002). Star Trek Star Charts: The Complete Atlas of Star Trek. Pocket Books. pp. 27. ISBN 0743437705.  
  3. ^ a b c d e f Okuda, Michael; Debbie Mirek, Doug Drexler (1999). The Star Trek Encyclopedia: A Reference Guide to the Future. Pocket Books. pp. 363. ISBN 0671536095.  
  4. ^ a b c d e f g h Mandel, Geoffrey (2002). Star Trek Star Charts. Pocket Books. ISBN 0743437705.  
  5. ^ Mandel, Geoffrey (2002). Star Trek Star Charts: The Complete Atlas of Star Trek. Pocket Books. ISBN 0743437705.   p. 12.
  6. ^ Mandel, Geoffrey (2002). Star Trek Star Charts: The Complete Atlas of Star Trek. Pocket Books. ISBN 0743437705.   p. 13.
  7. ^ Mandel, Geoffrey (2002). Star Trek Star Charts: The Complete Atlas of Star Trek. Pocket Books. ISBN 0743437705.   p. 26, 28.
  8. ^ Mandel, Geoffrey (2002). Star Trek Star Charts: The Complete Atlas of Star Trek. Pocket Books. ISBN 0743437705.   p. 26.
  9. ^ Mandel, Geoffrey (2002). Star Trek Star Charts: The Complete Atlas of Star Trek. Pocket Books. pp. 26. ISBN 0743437705.  
  10. ^ a b Mandel, Geoffrey (2002). Star Trek Star Charts: The Complete Atlas of Star Trek. Pocket Books. ISBN 0743437705.   p. 27.
  11. ^ Okuda, Michael; Debbie Mirek, Doug Drexler (1999). The Star Trek Encyclopedia: A Reference Guide to the Future. Pocket Books. pp. 636. ISBN 0671536095.  

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