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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.
Quick Answer. The distance from the earth to the moon is 1.25 light seconds, which is roughly 238,900 miles. Light years are reserved for dealing with massive distances in outer space. One light year is the distance that light can travel in one year.