A light-year is the distance that light travels in a vacuum in one Earth year. It's a measure of distance, not time.

0.5 light-year is equal to 4,730,500,000,000 kilometers.

Astronomers use light-years because the distances in space are so immense that kilometers become too small and difficult to manage.

While traveling at the speed of light is currently impossible, understanding distances like half a light-year helps in conceptualizing the challenges and possibilities of future interstellar travel.