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A light year is a unit of distance, not time, and is equal to the distance that light travels through space in one year. One light year is equal to the speed of light multiplied by a given time. Light travels at a speed of 300,000 kilometers per second, and time is one year, or 31,536,000 seconds.
Light years express the distance of celestial bodies in space, which means that the distance of a star from the Earth will be expressed in light-years and not in other units (kilometers, meters, centimeters).
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