A nanometer (nm) is one billionth of a meter. It's incredibly small, used for things like atoms and molecules.

A light-year is the distance light travels in a vacuum in one Earth year. It's a unit of distance, not time, used for vast cosmic distances.

This conversion is mainly used to illustrate the extreme difference in scale between microscopic objects and astronomical distances, often in educational contexts.

1,000,000 nanometers is equal to 0.001 meters, or 1 millimeter.