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The light-year is a unit of length used to express astronomical distances. It is about 9.5 trillion kilometres or 5.9 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.
So we now know that light travels at 186,000 miles per second and that is a distance of more than three quarters the way to the Moon. That is what is called a âlight second.â The distance light travels in one second is 186,000 miles.