How far is a lightyear?
A light-year (ly) is a unit of length used to measure the distance between stars. A light-year is defined as the distance light will travel in a year. One lightyear equals 9.461 × 1015 meters in vacuum, based on a reference year of 365.25 days.
Question posted 2008-04-12 10:13:29. Answered by FAQ TA® 2008-04-12 10:33:25.