Class M

English

English Wikipedia has an article on:

Class M planet

Wikipedia

Alternative forms

• class M

Etymology

Originally from the TV series Star Trek.

Adjective

Class M (not comparable)

1. (science fiction) Of a planet: having characteristics similar to that of Earth.

References

• Jesse Sheidlower, editor (2001–2025), “class M planet, n.”, in Historical Dictionary of Science Fiction.