A light-year is the distance that light travels in one Earth year. It is approximately 5.88 trillion miles (about 5.879 × 10¹² miles) or roughly 6 trillion miles when rounded for simplicity
. This distance is calculated by multiplying the speed of light (about 186,000 miles per second) by the number of seconds in a year, resulting in about 5.88 trillion miles traveled by light in one year.
