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The light-year is a unit of length used to express astronomical distances. It is about 9.5 trillion kilometres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word year, the term light-year is sometimes misinterpreted as a unit of time.
Light year is nothing but the distance that the light travels in one year. The value is very huge. That's why we use that as some reference to measure the distance particularly in space. The distance travelled by light in a year is 9 trillion km( accuratelyâ¦.9.461e+12). The distance between earth and moon is appr.