Here's why:
* Light travels at a finite speed: Light travels at approximately 299,792 kilometers per second (186,282 miles per second).
* Distance matters: It takes time for light to travel from one point to another.
* Light years: A light-year is the distance light travels in one year. So, a star 65 light years away means that the light we see from it now left the star 65 years ago.
Therefore, if the star suddenly stopped emitting light, we wouldn't notice it for 65 years because we'd continue to see the light that left the star 65 years ago.
