light-year
Light year. (Astron.) Defn: The distance over which light can travel in a year's time; -- used as a unit in expressing stellar distances. It is more than 63,000 times as great as the distance from the earth to the sun.
Light year. (Astron.) Defn: The distance over which light can travel in a year's time; -- used as a unit in expressing stellar distances. It is more than 63,000 times as great as the distance from the earth to the sun.