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Another method of time travel that is certain and reliable is travelling through black holes. O.K., I don’t mean through the singularity but through the region encompassed by the event horizon. This isn’t something that you can do with a quantum black hole or with a small airplane (although that might make a funny movie). This method requires a large black hole, and the region within the event horizon would have to be a fair percent of a light year across, but the mass would not make any real difference, ...