Yes they do. There is a common belief that astronauts do not age in space, or they age much more slowly than people on Earth, and this is true because of relativity, as time runs slowly the faster an object is moving. However, for relativistic effects to be visible, one must be travelling close to the speed of light, and the highest speed achieved by humans in space is nowhere near that speed. Eve... more

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Fotios Tsitsos

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