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A Stargate is an Einstein–Rosen bridge portal device within the ''Stargate'' fictional universe that allows practical, rapid travel between two distant locations. The devices first appear in the 1994 Roland Emmerich film ''Stargate'', and thereafter in the television series ''Stargate SG-1'', ''Stargate Atlantis'', and ''Stargate Universe''. In these productions the Stargate functions as a plot generator, allowing the main characters to visit alien planets without the need for spaceships or any other type of technology. The device allows for near-instantaneous travel across intra- and even intergalactic distances. Within the ''Stargate'' fictional universe, Stargates are large rings composed of a fictional superconductive mineral called "naqahdah".〔 Each Stargate has nine points (chevrons) spaced equally around its circumference which are used to determine the address being dialed. On the inner ring is a set of unique glyphs; on Milky Way and Pegasus gates, all but one of these represent star constellations, with the remaining symbol representing the planet or point of origin, while the meaning of the glyphs on Destiny-style gates is unknown. The number of glyphs is dependent on the network in which the gate belongs; Milky Way gates feature 39 glyphs, while Pegasus and Destiny gates have 36. Six of these symbols plus the point of origin serve to map out a specific location in space to which one can dial.〔''Stargate''〕 Additional glyphs may also be selected which increase the distance of travel, allowing gates outside the current galaxy to be reached, a process that requires significantly more energy than interstellar dialing. Pairs of Stargates function by generating an artificial stable wormhole between them, allowing one-way travel through. A typical Stargate measures 4.6 m (15 ft) in diameter and weighs 29 metric tonnes (64,000 lb). The Stargates were created millions of years ago by an alien civilization known as the Ancients; their modern history begins when Egyptologist Daniel Jackson deciphers their workings in the ''Stargate'' film.〔 ==Conceptual origin== The basic notion of the stargate concept is that it has at least two devices (stargates) in two distant positions, such that, when active, the rings of each become similar to a physical, singular gateway or door-frame between the two locations. The concept was developed by the writers of the feature film ''Stargate'', Dean Devlin and Roland Emmerich. Similar devices had been seen in previous fiction, but their complete conception as seen in the film was quite original – though there has been contention as to whether they plagiarized the idea from a previous script submission from a student of Egyptology named Omar Zuhdi who submitted a screenplay to them about ten years before the movie was made.〔 Zuhdi pursued legal action regarding this, and the case was eventually settled out of court.〔(【引用サイトリンク】 title=Litigation Analysis: Oklahoma Western District Court 5:95cv00090 )〕 The idea of a "portal" for travelers has been seen often throughout the history of both fantasy and science fiction, often taking a similar form, a device or magical object shaped as a regular or irregular closed geometric form filled with a water-like, rippling puddle that represents the boundary point between the two locations. The stargate picks up heavily on this conception, emphasizing the "watery puddle" for the sake of an alien mystique. Some early ''portal'' appearances in science fiction include A. E. van Vogt's novella ''Secret Unattainable'' (July 1942 Astounding), a radio episode of ''Space Patrol'' which aired October 25, 1952 (in which it was called a "cycloplex" or a "hole in space"), and Robert A. Heinlein's ''Tunnel in the Sky'' (1955) and its "Ramsbotham jump". In 2001: A Space Odyssey (novel), Arthur C. Clarke uses the term 'Star Gate' for the large sentinel TMA-2, which is a classic stargate portal to another part of the universe.〔Clarke, Arthur. ''2001 A Space Odyssey''. The New American Library, Inc, 1968, p. 188.〕 Much of the inspiration for the functioning of the device is drawn heavily from theoretical astrophysics, particularly that of black holes and wormholes, a staple of science fiction, often used to create "shortcuts" through space. Although these may exist in reality, it is not widely held to be true that any such phenomenon could safely transport a human being, as such wormholes would most likely be created by excessive gravity (e.g., from a black hole) which would destroy any potential traveler. In ''Stargate'' however, this is circumvented by transporting a traveller through as an energy signature, and reintegrating them at the other end. 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「Stargate (device)」の詳細全文を読む スポンサード リンク
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