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 approximately 5.88 trillion miles (or about 9.46 trillion kilometers) in one light-year.

Because a light-year represents an incredibly vast distance, light travels extremely fast, covering trillions of miles in just one year. 100,000 miles is a very small number compared to trillions.

No, this specific conversion (100,000 miles to light-years) is primarily used in educational contexts or to illustrate the immense scale of the universe, not for everyday measurements.