The cosmos is a dark, spooky place. More so when you realize that most of the matter in it actually lurks in voids.
If there was a dark alley in space, it would be the intergalactic medium (IGM)—the cold, diffuse gas that inhabits these shadows between galaxies and emits almost zero light. No human brain can even begin to grasp in what dead zone you would find yourself by following it to the end (if it even has one).
