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Related concepts are hyperdrive, warp drive and interstellar teleporter.
The series explores several themes, the most used is the notion of an interstellar teleporter that leaves the original being behind and sends only a duplicate.
The Door (interstellar teleporter), an interstellar transportation device used in the science fiction works of Lloyd Biggle, Jr.
An interstellar teleporter is a hypothetical technology appearing in science fiction, typically in soft sci-fi, which teleports people and/or other objects over interstellar distances instantaneously.
Ramsbotham Jump, a type of interstellar teleporter in Robert A. Heinlein's novel Tunnel in the Sky.
Also unlike Traveller, travel between planets was by means of interstellar teleporter gates, maintained by ICE, the Imperial Corps of Engineers, not starships, changing play dynamics considerably.