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The concept of moving not only through space but through time as a dimension, typically via relativistic effects (time dilation) or exotic configurations of spacetime (wormholes). Unlike science‑fiction portrayals, spacetime travel is already real in a limited sense: astronauts on the ISS experience slight time dilation, and GPS satellites must account for relativistic effects. True spacetime travel to the future is theoretically possible via near‑light‑speed journeys; travel to the past remains highly speculative, often running into paradoxes. The term captures the human desire to treat time as a navigable medium rather than an inexorable flow.
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