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On the day his daughter is born, Jack leaves her on Earth and departs on a...

On the day his daughter is born, Jack leaves her on Earth and departs on a spaceship to travel around the universe at a constant speed of 0.91c. He returns to Earth on the day of his daughter's 7th birthday. Calculate the duration of the trip as measured by Jack.
(Give your answer in years but don't include the units.)

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