A light-year is the distance that light travels in one year, which is about 9.46 trillion kilometers or 18,922,000,000,000,000 meters.

2 light-years is equal to 18,922,000,000,000,000 meters.

Astronomers use light-years because the distances in space are incredibly vast, making meters impractical for everyday use in astronomy.

A light-year is a unit of distance, representing the distance light travels in a year.