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

There are 5,280 feet in one mile.

This conversion is primarily for understanding and illustrating the extreme difference in scale between everyday measurements and the vast distances in space. It's not a typical practical calculation for most people.

No, 10,000 feet is an extremely small distance when compared to astronomical units like light-years. It's about 1.89 miles or roughly 3 kilometers.