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Light years

An astronomical unit of distance is the light-year, which is the distance light travels in one year. Compute this distance in meters. How many meters away is a star at a distance of 4 light-years from the earth?

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Solution.

The speed V of light is V=299792458 (m/second). The ...

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This solution explains in 38 words how to calculate distance using speed of light and time.

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