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The focused study of other planets and celestial bodies as places to understand and eventually inhabit. It goes beyond pure astronomy to include planetary geology (are there stable lava tubes for habitats?), comparative climatology, extraterrestrial soil chemistry (for agriculture), and the search for native life that could complicate settlement. It's applied planetary science with a direct goal: to assess resources, evaluate risks, and provide the knowledge needed to build a home off-Earth.
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