Wormholes could be used to travel through time, says astrophysicist Eric Davis of the EarthTech International Institute for Advanced Studies at Austin. The problem, though, is that wormholes and traveling back in time are still theoretical, but Davis is undeterred: "I am confident that, since [general relativity] theory has not failed yet, that its predictions for time machines, warp drives and wormholes remain valid and testable."

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