The Unknown is a verse that has a size so large only purple light has escaped in the infinite amount of time it had been existent. Wait another infinity years and this ball will be white.
In the center lies the Junkverse and the Poorly Misplaced Junkverse. These two alone don't produce any visible light, but the interfering forces cause an extremely bright light to appear at a very far distance. From the inside, this light is invisible, it only becomes apparent when the observer travels to a distance akin to the diameter of the Unknown.
The reason for the pink tint of the light is still unknown.