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'''Ice World''' is the term given to perpetually cold planets covered in glaciers and snow and located so far from their sun that they are locked in a permanent ice age. Even those accustomed to living amid such cold environment must treat it with a wary respect lest complacency leads to their demise."Ice world" is not a technical [[class (planet)|planet classification]], but a general term referring to its natural environment.{{Cite ThisFn|3}}