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Orion's Arm (or "OA" for short) is a wiki which collects the collaborative work of this online hard science fiction world-building project. See also http://www.orionsarm.com/.

English: Started 15 April 2007 by Eyu100. Interwiki links: w:c:orionsarm URL: http://orionsarm.wikia.com/

Visit The English language Wikia about Orion's Arm