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

100,000 feet is an extremely small fraction of a light-year, approximately 0.0000 light-years. This means it's incredibly close in astronomical terms.

Astronomers use light-years because the distances between celestial objects are so vast that using miles or feet would result in astronomically large and impractical numbers.

The distance to the Andromeda Galaxy, our nearest major galactic neighbor, is about 2.5 million light-years away.