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Learn what a light year is, how to measure it, and how it differs from other units of length in astronomy. Find out the distance to various astronomical objects in light years and see a map of stars near Earth. A light year is a unit of distance, not time, that measures how far light travels in one Earth year. Learn how to calculate the distance of one light year and compare it with other units of cosmic distances. A light-year is the distance light travels in one Earth year, about 6 trillion miles. Learn how we use light-years to measure the distance of objects in space and how they relate to time and space. Light-year ... A light-year, alternatively spelled light year (ly or lyr[3]), is a unit of length used to express astronomical distances and is equal to exactly 9 460 730 472 580.8 km, which is approximately 9.46 trillion km or 5.88 trillion mi.
