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
West Yorkshire Hurdle West Yorkshire Hurdle The West Yorkshire Hurdle is a Grade 2 National Hunt hurdle race in Great Britain which is open to horses aged four years or older. It is run at Wetherby, West Yorkshire, over a distance of about 3 miles (3 miles and 26 yards, or 4,852 metres), and during its running there are twelve hurdles to be jumped. The race is scheduled to take place each year in late October or early November. The event was established in 1990, and it was initially contested over 3 miles. It was extended to about 3 miles and 1 furlong