If you throw a ball as hard as you can into nothing, why doesn’t it hit you in the face?
Well, because it doesn’t have anything to bounce off of. Light works the same way, you can only see light that hits your eye, and light travels in straight lines (ignoring that gravity can bend light because that’s irrelevant to this answer). So if light *isn’t* traveling towards your eyes, you can’t see it. Most of the light the sun gives off never hits anything that bounces it back to your eyes, so you never see that light.
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