human
I've heard that if you have a problem with your eyesight, you should look up at the stars. Why is that?
assistant
Well, it’s because the light from the stars is so far away that it takes a long time to reach us. If we looked down on the stars, they would be too small to see. But if we look up at them, then the light from the stars will take a long time to reach us, and we can see them.