A light-year is the distance that light travels in vacuum in one Julian year (365.25 days). It is a unit of astronomical distance.

There are approximately 9.46 trillion (9,460,000,000,000) kilometers in one light-year.

The conversion is extremely small because a light-year is an enormous distance, and 500,000 kilometers is a relatively tiny distance on a cosmic scale.

No, 500,000 kilometers is not a significant distance in space. It's a distance commonly measured within our solar system, for example, to the Moon, but negligible when discussing interstellar distances measured in light-years.