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A woman leaves earth in a spacecraft that makes a round trip to the nearest star 4lightyears distant, at a speed of 0.9c. How much younger is she upon her return than her twin sister who remained behind?
The 2nd postulate: The speed of light in free spaces has the same value for all observers ... Eg. (Twin paradox) A woman leaves the earth in a spacecraft that makes a round trip to a star, 4 light-year distant, at a speed of 0.9c. How many years younger is she upon her return than his twin sister who remained behind?
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