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Suppose you are planning a trip in which a spacecraft is to travel at a constant velocity for exactly nine months, as measured by a clock on board the spacecraft, and then return home at the same speed. Upon return, the people on earth will have aged exactly seventy-five years. According to special relativity, how fast must you travel? (Express your answer to at least 5 significant figures as a multiple of c -- for example, 0.95585c.)

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