Class M
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Class M is a term commonly used in Star Trek to describe planets that are environmentally similar to Earth. The term may derive from the Vulcan designation of "Mentaka-class" that was once used in Star Trek: Enterprise.
Class M planets typically have the following features:
- Gravity of approximately 1 G.
- An atmosphere that is over 70% nitrogen, around 20% oxygen, and otherwise non-toxic to humanoids.
- Large bodies of water.
- A climate that is suitable for humanoid life and other flora and fauna that are typical of Earth life.
Most Class M planets already support life of some sort, and many are home to native humanoid civilizations.