It is the law of Universe that will move the light to fill the areas where there is a lack of light. Since all of creation is by nature comprised of light, then darkness always and forever has light trickle into it, unless that trickle is blocked by some force, or act of will. The darkness I speak of is not as the darkness of space. Space in this context is an integral aspect of the living Universe. Darkness and space are very different things.
Space is full of light.
Not just light that we see with our eyes, but the light of Spirit. Also radiowaves, microwaves, Gamma and Cosmic radiation that are part of the electromagnetic spectrum. Visible light is a very narrow band within this spectrum. And, of course, if light could not move thru space, we could not see the stars in the night sky or the Sun in the day. They are part of the shape of the universe, caused by, and effecting the space time continuum, that is the basis of the shape of the universe.