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interstellar travel wormhole space time warp drive Einstein Podolsky Rosen bridge singularity black hole white hole event horizon naked singularity closed timelike curve Gödel spacetime Tipler cylinder Dyson sphere tachyon tachyonic antitelephone faster-than-light superluminal subluminal transluminal luminal light-speed warp bubble Alcubierre drive negative energy exotic matter warp field spacetime curvature gravity relativity physics science technology future exploration universe cosmos astronomy astrophysics