In the Star Trek universe, a Class M planet is one habitable by humans and similar life forms. Earth, Vulcan, Romulus, and Qo'noS are examples of Class M planets.[1] The planet needs an atmosphere of oxygen and nitrogen, should be close to a stable star, have fertile soil, a tolerable gravity, a climate that is generally pleasant for humans.[2] Most planets shown in the franchise are Class M planets; occasionally another alphabetically named class of planet is shown, each hostile to humanoid life in one or more ways. As a story device, this allowed for easy filming without restriction by environmental suits,[3] but Science correspondent Gretchen Vogel called it a "failure of imagination" when thinking about the limits of the zone capable of supporting life.[2] The origin of the term within the fictional universe is implied to be the Vulcan word Minshara.[1]
^ abFazekas, Andrew (July 22, 2016). "How to See 'Star Trek' Worlds in the Night Sky". National Geographic. National Geographic Society. Archived from the original on July 25, 2021. Retrieved July 25, 2021.
^Erdman, Terry J.; Block, Paula M. (23 September 2008). Star Trek 101: A Practical Guide to Who, What, Where, and Why. Gallery Books. p. 21. ISBN 9780743497237.
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