Matches in DBpedia 2014 for { ?s ?p A light-year (symbol: ly), sometimes written light year or lightyear, is a unit of length used in astronomy, though it is sometimes mistaken for a unit of time. It is equal to just under 10 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year.The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist and popular science publications. The unit usually used in professional astrometry is the parsec (symbol: pc, approximately 3.26 light-years; the distance at which one astronomical unit subtends an angle of one second of arc).. }
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- Light-year abstract "A light-year (symbol: ly), sometimes written light year or lightyear, is a unit of length used in astronomy, though it is sometimes mistaken for a unit of time. It is equal to just under 10 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year.The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist and popular science publications. The unit usually used in professional astrometry is the parsec (symbol: pc, approximately 3.26 light-years; the distance at which one astronomical unit subtends an angle of one second of arc).".