What does a light-year mean? How much is a light year?

Light-year is a unit of length, which refers to the distance that light travels in a straight line in a vacuum for one year.

Light-year is a unit of length, which refers to the distance that light travels in a straight line in a vacuum for one year.

It is a unit used in astronomy to measure the distance between celestial bodies. 1 light year is 9460730472580800 meters. The calculation method is distance = speed× time, and the speed of light is 300,000 kilometers per second (299,792,458 meters )×1year (315,536,000 seconds). Light years are often mistaken for "years", but there are essential differences between them. Light years are units of length, while years are units of time.