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Travel at speeds close to the speed of light, where relativistic effects (time dilation, length contraction, mass increase) become significant. Unlike faster‑than‑light travel (which is speculative), relativistic travel is physically possible, albeit extremely challenging. A spacecraft accelerating to 0.99c would allow crew to reach distant stars within their lifetimes due to time dilation, while centuries pass on Earth. Relativistic travel is a staple of hard science fiction, offering a plausible (if slow) way to cross interstellar distances without breaking physics. However, energy requirements are astronomical, and collisions with interstellar dust become deadly.
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