- found: Barnhart, R.K. Dict. of science (light-year (Astronomy): the distance that light travels in a vacuum in one year: about 9.5 trillion kms. or almost a third of a parsec. Light-years are used to measure distances to or between stars)
- found: Wikipedia, Apr. 23, 2007 (light-year: a light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one Julian year)
- Example under [Units of measurement]
- 1986-02-11: new
- 2007-05-25: revised
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