Light can travel in the absence of a medium. That means light from the star( eg. Sun) can travel infinitely in the absence of obstructionss in its path. Then why is he space not illuminated? Light from all the stars is capable of reaching the boundaries of the universe, if any. Also then we may use powerful laser light to determine the extent of he universe by projecting it into the space and calculating the distance it covered by using the time it consumed
I'm going to guess that this question is about the fact that for someone in the near vacuum of space not looking at the sun, things generally look dark. The reason for this is that light doesn't scatter off light. If you shine two flashlight beams in a dark dust-free room so that the beams intersect, the beams go right through one another without scattering. Try it. If the room is really dust free, you can't even see the beams! You only notice things illuminated by light - you can't see light itself.
In space there are few things for light to reflect off of, and if you are not looking directly at a source of light or something that's reflecting light, little or no light is going into your eyes.
That doesn't mean that there isn't a lot of light from the sun throughout the space in and beyond our solar system. It just means that the light is mostly streaming outward and you can't notice it unless some of it is being reflected into your eyes.
I'm going to guess that this question is about the fact that for someone in the near vacuum of space not looking at the sun, things generally look dark. The reason for this is that light doesn't scatter off light. If you shine two flashlight beams in a dark dust-free room so that the beams intersect, the beams go right through one another without scattering. Try it. If the room is really dust free, you can't even see the beams! You only notice things illuminated by light - you can't see light itself.
In space there are few things for light to reflect off of, and if you are not looking directly at a source of light or something that's reflecting light, little or no light is going into your eyes.
That doesn't mean that there isn't a lot of light from the sun throughout the space in and beyond our solar system. It just means that the light is mostly streaming outward and you can't notice it unless some of it is being reflected into your eyes.
