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Slipstream travel is a speculative advanced-transport concept describing movement through a reduced-resistance transit corridor, engineered flow channel, or non-ordinary route medium that allows faster long-distance travel than conventional flight through normal space.
Space folding is a speculative advanced-transport concept describing the compression, bending, or topological shortcutting of space so that distant locations can be brought effectively closer together for rapid transit.
Wormhole travel is one of the most famous concepts in advanced alien propulsion lore, describing the idea that a craft could move between distant points through a shortcut in spacetime rather than by crossing the normal distance in ordinary space.