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The study of planetary habitability is partly based upon extrapolation from knowledge of the [[Earth's conditions, as the Earth is the only planet currently known to harbour life (The Blue Marble, 1972 Apollo 17 photograph)]]

The study of planetary habitability is partly based upon extrapolation from knowledge of the [[Earth's conditions, as the Earth is the only planet currently known to harbour life (The Blue Marble, 1972 Apollo 17 photograph)]]

行星可居住性的研究部分基于对[[地球条件]的了解推断，因为地球是目前已知的唯一一颗拥有生命的行星

对行星可居住性的研究主要基于对[[地球条件]的了解进行推断，因为地球是目前已知的唯一一颗拥有生命的行星