light year
light year
English Definitions:
light year, light-year (noun)
the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers
light year (Noun)
A unit of length (abbreviation ly; equal to just under 10 trillion kilometres (10 metres)) equal to the distance light travels in one year; used to measure extremely large distances.
light year (Noun)
(in plural light years; figurative, informal) A very long way.
light year (Noun)
(in plural light years; figurative, informal, nonstandard) A very long time.
light year
A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (9.46×1012 km), or 5.88 trillion miles (5.88×1012 mi). 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). Because it includes the time-measurement word "year", the term light-year is sometimes misinterpreted as a unit of time.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. The unit most commonly used in professional astronomy is the parsec (symbol: pc, about 3.26 light-years) which derives from astrometry; it is the distance at which one astronomical unit subtends an angle of one second of arc.
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"light year." Kamus.net. STANDS4 LLC, 2024. Web. 26 Apr. 2024. <https://www.kamus.net/english/light+year>.
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