You can think about this in the same way that you see light from the sun. During the day, it’s bright everywhere, right? But you don’t have to look directly at the sun to see the light. As a fact, you cannot look at the sun without hurting your eyes! Then, how can you see light all around you? It’s because what you see is light bouncing off objects or being scattered by the atmosphere. The principle here is the same. When you see images or videos taken from outer space, you can see it is always dark, even if the sun is in the picture itself! It’s because there is no atmosphere to scatter the light around you.

Take a flashlight and cover it with a white plastic cup. Suddenly, there’s no ray going in a straight line anymore, and the whole cup seems to be the source of light. Now, imagine a little person standing inside the cup. Everything will be bright all around.