2006-11-02 Space Colony Art from the 1970s http://www.nas.nasa.gov/Services/Education/SpaceSettlement/70sArt/art.html 素晴らしい! ◇ スペースコロニー - Wikipedia http://ja.wikipedia.org/wiki/%E3%82%B9%E3%83%9A%E3%83%BC%E3%82%B9%E3%82%B3%E3%83%AD%E3%83%8B%E3%83%BC