Whether Ls were so designated because they were close to Ms, or if M just happened to fall into the middle of a range of criteria, we do not currently know. The M-Class designation for a terrestrial planet, as others have pointed out, probably descended from the Vulcan designation of "Minshara-class" it's also worth noting that 'marginally habitable' planets, such as one with an oxygen/argon atmosphere, were classified as "Class-L". It seems likely that the Federation's planetary classification scheme developed in a similar way. The system we currently use is a development from an earlier system which classified stars in types from I - V the system was then rearranged several times as more information was gathered. Our sun is a Class G2, meaning it's a hot main-sequence star between 5,300 and 6,000 kelvin. This system consists of a seemingly rather random set of classes - Classes O, B, A, F, G, K, and M. Out of universe, the designation of "Class M" was probably based on the real-life system of Stellar Classification, which describes stars.
The term also appeared on Enterprise's computer displays, indicating that Starfleet adapted it eventually.
The first spoken use of the word was in ENT: "Home", in which Archer used it to describe Archer IV, a planet implied (but not confirmed) to be Minshara class in ENT: "Strange New World".
However, this mention was barely legible on-screen and may have been included by an art department not yet aware of the intention to use "Minshara class". From an in-universe standpoint, the term M-class was first seen chronologically in a text within the Handbook of Exobiology in "Strange New World", the same episode that introduced Minshara-class. This assumption has been contested by some fans, but is at least supported by the reference book Star Trek: Star Charts. The implied consequence being that the two terms meant the same, and possibly even that M stood for Minshara. The Vulcan term "Minshara-class" (first used in ENT: "Strange New World") was used in Enterprise to denote planets that in other series would have been called class M by the writers, the implied consequence being that the two terms meant the same - Memory Alpha So that would explain why it's an M, which is smack-dab in the middle of the alphabet, and not at the beginning or end.Ĭontinuing to assume, we might assume that the other letters were decided after Minshara was shortened to M, seeing as they appear to lead up to M being inhabitable. I would assume that over time, this was shortened to just M. In Enterprise, they use a different name: Minshara-class.
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