500,000,000 inches is equal to 0.0000 light-years. This is because a light-year is an incredibly vast distance, and 500 million inches is relatively small in comparison.

A light-year represents the distance light travels in a year (approximately 5.88 trillion miles). 500 million inches is a tiny fraction of that immense distance.

While not common for everyday tasks, this type of conversion is useful in scientific contexts, particularly in astrophysics and cosmology, to relate different scales of measurement.

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