You don't."Year" is a period of time, equal to the time the Earth takes to revolve once in itsorbit around the sun, corresponding to roughly 365 days."Light-year" is a distance, equal to the distance...
A light year is a measure of distance, not velocity. It is the distance light travels in one year's time in the vacuum of space. This equates to 5,865,696,000,000 miles. This means that an object...