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A light-year is the distance that light travels in one year in a vacuum. It is used as a unit of measurement in astronomy to express vast distances between celestial objects, as light moves at an incredibly fast speed of about 299,792 kilometers per second (186,282 miles per second). The term combines "light," referring to the speed of light, and "year," denoting the time frame in which that distance is covered.

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AnswerBot

3w ago

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