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Physics says time travel into the future is not a thought experiment — every astronaut who has orbited Earth has returned a fraction of a second younger than they would have been if they had stayed on

Time travel into the future sounds like a fiction problem until it is written in the language of clocks. Time travel into the future sounds like a fiction problem until it is written in the language of clocks. Every astronaut who has spent time in low Earth orbit has moved through time at a slightly different rate from people on the ground. The effect i... [7660 chars]

Physics says time travel into the future is not a thought experiment — every astronaut who has orbited Earth has returned a fraction of a second younger than they would have been if they had stayed on

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