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A light-year (or light year, abbreviation: ly[3]) is a unit of length used informally to express astronomical distances. It is approximately 9 trillion kilometres (or about 6 trillion miles).[note 1] 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).[2]
Distances measured in light-years include distances between nearby stars, such as those in the same spiral arm or globular cluster. One kilolight-year, abbreviated kly, is one thousand light-years (about 307 parsecs). Kilolight-years are typically used to measure distances between parts of a galaxy.