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The L5 Society was founded in 1975 by Carolyn Meinel and Keith Henson to promote the space colony ideas of Gerard K. O'Neill. The name comes from the and Lagrangian points in the Earth–Moon system proposed as locations for the huge rotating space habitats that O'Neill envisioned. and are points of stable gravitational equilibrium located along the path of the moon's orbit, 60 degrees ahead or behind it. An object placed in orbit around (or ) will remain there indefinitely without having to expend fuel to keep its position, whereas an object placed at , or (all points of unstable equilibrium) may have to expend fuel if it drifts off the point. ==Founding of L5 Society== O'Neill's first published paper on the subject, "The Colonization of Space", appeared in the magazine ''Physics Today'' in September 1974. A number of people who later became leaders of the Society got their first exposure to the idea from this article. Among these were a couple from Tucson, Arizona, Carolyn Meinel and Keith Henson. The Hensons corresponded with O'Neill and were invited to present a paper on "Closed Ecosystems of High Agricultural Yield" at the 1975 Princeton Conference on Space Manufacturing Facilities, which was organized by O'Neill.〔(Chapter 5: O'Neills Children ), Reaching for the High Frontier, The American Pro-Space Movement 1972-84, by Michael A. G. Michaud, National Space Society.〕 At this conference, O'Neill merged the Solar Power Satellite (SPS) ideas of Peter Glaser with his space habitat concepts.〔(Pg 5 ), Archive for December, 1975, Space Studies Institute〕 The Hensons incorporated the Society in August 1975, and sent its first 4-page newsletter in September to a sign up list from the conference and O'Neill's mailing list.〔Brandt-Erichsen, David (1994-11). The L5 Society. "Reprinted from Ad Astra, the magazine of the National Space Society, Nov.-Dec., 1994." Ad Astra, November/December 1994. Retrieved from http://www.nss.org/settlement/L5news/L5history.htm.〕 The first newsletter included a letter of support from Morris Udall (then a contender for US president) and said "our clearly stated long range goal will be to disband the Society in a mass meeting at ."〔(L-5 News, 1975 ), L-5 News, A Newsletter from the L-5 Society, Number 1, September 1975〕 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「L5 Society」の詳細全文を読む スポンサード リンク
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