Question a spaceship travels at a constant speed from earth, Ask an Expert

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Question: A spaceship travels at a constant speed from earth to a planet orbiting another star. When the spacecraft arrives, 13 years have elapsed on earth, and 8.9 years have elapsed on board the ship.

A- How far away is the planet, according to observers on earth?

Answer in meters.

If possible just a brief explanation how you got the answer?

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