A light-year is the distance light travels in a vacuum in one Earth year, which is approximately 9.46 trillion kilometers or about 5.88 trillion miles.

A nanometer (nm) is a unit of length in the metric system equal to one billionth of a meter (10⁻⁹ m).

While light-years measure vast cosmic distances, converting to nanometers is usually for theoretical or educational purposes to highlight the extreme difference in scales, or in highly specialized scientific contexts where such comparisons might be relevant.

0.1 light-year is equal to 9.460999999999999e+23 nanometers.