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Closed ecological system
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==In fiction== Closed ecological systems are commonly featured in fiction and particularly in [[science fiction]]. These include [[Domed city|domed cities]], [[Space stations and habitats in fiction|space stations and habitats on foreign planets or asteroids]], cylindrical habitats (e.g. [[O'Neill cylinder|O'Neill cylinders]]), [[Dyson Sphere|Dyson Spheres]] and so on.<ref>Westfahl, Gary (2005). "Space Habitats". The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Greenwood Publishing Group. pp. 736β737. ISBN 978-0-313-32952-4.</ref>
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