Light-year Light-year The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 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 (365.25 days). Because it includes the 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 nonspecialist and popular science publications. The unit most commonly used in professional astrometry is the parsec
British Champions Long Distance Cup British Champions Long Distance Cup The British Champions Long Distance Cup is a Group 2 flat horse race in Great Britain open to thoroughbreds aged three years or older. It is run at Ascot over a distance of 1 mile 7 furlongs and 209 yards (3,209 metres), and it is scheduled to take place as part of British Champions Day each year in October. The event was originally held at Newmarket under the title Jockey Club Cup. It was established in 1873, and was initially contested over 2¼ miles. The distance of the race was shortened to 1½ miles in