What Is a Light-Year? ✨ #shorts #lightyear

追加: 2026-05-27

A light-year is a unit of distance, not time, representing how far light travels in one year at approximately 300,000 kilometers per second; since light can circle Earth about 7 times in one second, over the course of a full year, it covers an enormous distance of about 9.46 trillion kilometers, making the light-year a practical measurement for expressing vast cosmic distances between celestial objects.