View source for Planetary Classification

===Class M===
* Terrestrial
* previously known as [[Vulcan|Minshara]]-class by [[Vulcan Science Directorate]], [[Earth]]-type by [[UESPA]] (ENT, TOS)
* Significant surface water, below 80% coverage
* Atmosphere consisting of nitrogen, oxygen, trace elements
* Habitable by humanoid life
* Subdivided into type 1-4, indicating most to least suitable for humanoid life (TNG: "The Bonding")

(''Star Charts'' unless otherwise referenced)