The same logic would apply to the earth and all the other planets. Why can we see Mars from earth? Mars does not produce light. Why could the astronauts take a picture of the earth from space? The earth does not produce light. Let's say for a moment that the earth were 4 million miles further away from the sun, would it still be visible from a space shuttle? Of course it would! Regardless of where we put the earth, light from the sun is still going to reflect off it and make it "visible".
So, space is full of light, but that light is imperceptible unless it is reflecting off something. Is that true? I believe so. On earth, everything we see is only light reflected off an object with mass. Even the sky is light reflecting off our atmosphere. Light is everywhere, but cannot be perceived without objects to reflect off of.
I believe this has a gospel parallel. We often hear Christ referred to as the Light of the World. I think Christ's love is an extension of this light analogy. As we just discussed, light is everywhere. It fills all of space. Light, however, is imperceptible without reflectors. Likewise, Christ's love is manifested through His faithful followers. We are the "reflectors" that make the Light perceptible to those who see the world as a dark void.
I'd love to hear thoughts, rebuttals, and/or other parallels about this thought. What do you think?