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ANSWER:The light year is based upon Earth years. It would be 10 years. It would take the light 5 years to get to the mirror, and 5 years to travel back.

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So if we doing it today, we will see trough that mirror over 10 years the planet as today.

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Q: If a light was shined at a mirror 5 light-years away in space how many Earth-years would it take for the light to go out and be reflected back to earth?
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