Stargate (device)

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, they represent points in space (most commonly star constellations and planets), with one of those symbols 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. 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 the one-way travel of matter (energy can travel either way through an open wormhole). A typical Stargate measures 6.7 m (22 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.

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