This physics video tutorial explains the concept of the light-year which is unit of distance and not time. This video also explains how to convert light-years to meters, kilometers, and miles.
Distance, Displacement, Average Speed, and Average Velocity:
https://www.youtube.com/watch?v=-Py2zI29THg&t=3s
How Long Does It Take Light to Travel From The Sun to the Earth?
https://www.youtube.com/watch?v=2htZbZEHnAk
More Physics Videos:
https://www.video-tutor.net/physics-basic-introduction.html
