From Imperial Wiki
A wormhole is a theoretical phenomenon that exploits the "curvature of space" to create a shortcut between two distant locations. While wormholes are theoretically possible, no real wormhole has ever been detected.
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Wormholes in Science Fiction
Wormholes, whether natural or artificial, are common methods of interstellar or even intergalactic travel in science fiction stories, effectively teleporting objects of arbitrary size across arbitrary distances.