pikkusühik, mis on võrdne vahemaaga, mille valguskiir läbib ühe aasta jooksul
unit of length used to express astronomical distances, equal to the distance that light travels in vacuum in one Julian year (365.25 days)
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The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in nonspecialist and popular science publications. The unit usually used in professional astrometry is the parsec [ IATE:1412953 ]. https://en.wikipedia.org/wiki/Light-year
Alternatively the light-year (ly) is sometimes used in scientific papers as a distance unit, although its use is mostly confined to popular publications and similar media. The light-year is roughly equivalent to 0.3 parsecs, and is equal to the distance traveled by light in one Julian year in a vacuum, according to the IAU.
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