KnowraRare Earth hypothesisLinked fromLinked fromThe 12 pages that link to Rare Earth hypothesis, each with the reason it gives.All 12Related 1Compared with 11AstrobiologyCompared with: It challenges assumptions that habitable planets commonly develop complex life.Planetary habitabilityCompared with: It challenges the assumption that widespread potentially habitable environments yield widespread complex life.Habitable zoneCompared with: It emphasizes that a habitable-zone orbit alone may be insufficient for complex life.Fermi paradoxCompared with: It resolves the paradox by arguing that technological civilizations are exceptionally rare.Carl SaganCompared with: It offers a more restrictive estimate of inhabited worlds than Sagan’s openness to widespread life.Drake equationCompared with: It challenges optimistic assumptions about how often habitable planets produce complex life.Great FilterCompared with: It emphasizes rare environmental prerequisites rather than one dominant evolutionary bottleneck.Earth analogCompared with: It questions whether Earth-like planetary properties alone make inhabited worlds likely.Extraterrestrial lifeCompared with: It offers a counterpoint to assumptions that life readily arises on habitable worlds.Extraterrestrial intelligenceCompared with: It contrasts with expectations that habitable worlds often produce intelligent civilizations.Alternative biochemistryCompared with: Alternative biochemistry could expand the range of environments capable of supporting life.