![]() The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist contexts and popular science publications. ![]() Because it includes the word " year", the term is sometimes misinterpreted as a unit of time. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). Map showing the stars that lie within 12.5 light-years of the Sun Ī light-year, alternatively spelled light year, ( ly) is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km, which is approximately 5.88 trillion mi. ![]()
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