A light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). It's approximately 9.46 trillion kilometers.

5000 kilometers is a very small fraction of a light-year, roughly 0.0000 light-years.

Light-years are used because the distances between stars and galaxies are immense, making kilometers impractical for measurement.

Yes, you can convert kilometers to light-years by dividing the number of kilometers by the number of kilometers in one light-year (approximately 9.46 trillion).