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第1行： + + + + − + − − − 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)]] − − 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
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{{#seo:
|keywords=盖亚理论,盖亚假说,复杂系统
|description=盖亚假说认为，生物体与地球上的无机环境相互作用，形成一个协同和自我调节的复杂系统，有助于维持和延续地球上的生命条件。
}}
[[File:The Earth seen from Apollo 17.jpg|thumb|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 ]]
[[File:The Earth seen from Apollo 17.jpg|thumb|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)]]