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A space habitat (also called a space colony, space settlement or orbital colony) is a type of space station, intended as a permanent settlement rather than as a simple way-station or other specialized facility. No space habitats have yet been constructed but many design proposals have been made, with varying degrees of realism, by both engineers and science fiction authors. The term ''space habitat'' is sometimes used more broadly to include colonies built on the surface of a body other than Earth, such as the Moon, Mars or an asteroid. This article concentrates on self-contained structures built in Micro-g environment. ==Motivation== Several motivations for building space colonies have been proposed: * Survival of human civilization and the biosphere, in case of a disaster on the Earth (natural or man-made) * Huge resources in space for expansion of human society * Expansion without any ecosystems to destroy or indigenous peoples to displace * It could help the Earth by relieving population pressure and taking industry off-Earth. (See: Reasons for space colonization or Space and survival.) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Space habitat」の詳細全文を読む スポンサード リンク
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