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An astronaut travels to a distant star with a speed of \(0.46c\) relative to Earth. From the astronaut's point of view, the star is \(4.40\) light-years (ly) from Earth. On the return trip, the astronaut travels with a speed of \(0.90c\) relative to Earth. What is the distance covered on the return trip, as measured by the astronaut? Give your answer in light-years.

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