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Planetary chauvinism is the belief that human society will always be planet-based (even if extended beyond Earth), and overlooks or ignores the potential benefits of space-based living.[1] The idea can be extended to alien society in general, that is, we should expect alien society to be planet based.[2] The coining of the term is often credited to Isaac Asimov, but in an interview with Bill Boggs, Asimov mentions that he heard it from Carl Sagan.[3] The counter-argument is that all the benefits of a planet can be achieved in space, e.g., by an O'Neill cylinder-type structure.[4]
An even narrower version of planetary chauvinism is G-star chauvinism. This is the assumption that intelligent life will always evolve in star systems similar to our own, that is, in stars of spectral class G.[5] Carl Sagan criticised this belief on the grounds that intelligent life has a greater chance of evolving on the most long lived stars. That suggests that class-M and class-K stars are more likely candidates, not only because of their lifetime, but also because they are far more numerous than class-G stars.[2]
There are several hypotheses of the possibility of life originating in the universe in places other than planets.[6][7][8]
Thomas Gold, who advocated for the possibility of life in deep biospheres below the surfaces of celestial bodies,[9] has criticized science which only focuses on the surface and not below in its search of life as surface chauvinism.[9]
Similarly, the focus on surface-bound and territorial space advocacy, particularly for space colonization, has been termed surfacism, neglecting interest for atmospheres and potential atmospheric human habitation, such as colonization above the surface of Venus.[10][11]