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1 light-year is a unit of length that represents the distance light travels in 1 year. The closest star, Proxima Centauri, is 4.2 light-years away from Earth. How much time would it take for light to travel from Proxima Centauri to Earth?
- 8.4 years - 1 light-year - 4.2 light-years - 1 year - 4.2 years
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