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A statite (a portmanteau of ''static'' and ''satellite'') is a hypothetical type of artificial satellite that employs a solar sail to continuously modify its orbit in ways that gravity alone would not allow. Typically, a statite would use the solar sail to "hover" in a location that would not otherwise be available as a stable geosynchronous orbit. Statites have been proposed that would remain in fixed locations high over Earth's poles, using reflected sunlight to counteract the gravity pulling them down. Statites might also employ their sails to change the shape or velocity of more conventional orbits, depending upon the purpose of the particular statite. The concept of the statite was invented independently (and approximately simultaneously) by Robert L. Forward (who coined the term "statite"), and by Colin McInnes, who used the term "halo orbit"〔McInnes, C. R. and Simmons, J. F. L.: "Halo Orbits for Solar Sails --- Dynamics and Applications," ESA Journal, Vol. 13, 1989, pp.229-234〕 (not to be confused with the type of halo orbit invented by Robert Farquhar). Subsequently the terms "non-Keplerian orbit" and "artificial Lagrange point" have been used as a generalization of the above terms. No statites have been deployed to date, as solar sail technology is still in its infancy. NASA's cancelled Sunjammer solar sail mission had the stated objective of flying to an artificial Lagrange point near the Earth/Sun L1 point, to demonstrate the feasibility of the (Geostorm ) geomagnetic storm warning mission concept proposed by NOAA's Patricia Mulligan. ==See also== *Dyson bubble *Sunshade *Solar mirror 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「statite」の詳細全文を読む スポンサード リンク
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