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How much younger are astronauts after they return from orbit?

April 26, 2017astronauts Orbit Return younger

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How much younger are astronauts after they return from orbit?

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A. When an astronaut returns home they will be 0.000023 seconds younger for each day they spend in orbit. For a one-year stay on the International Space Station, the returning astronauts will be about 0.0085 seconds younger. Not much to get excited about, but it is measurable on a good stopwatch if the experiment is set up correctly.