White holes are theoretical, scientific opposites to black holes, areas of spacetime where no object can enter.

In-game, they serve as dimensional portals, creating additional universe listboxes, and are generally the easiest way to get a new 'verse, rather than sifting through individual atoms.

White holes will always be found inside black holes, and in the Nested universe seem to be linked to their dark counterparts, replacing the destructive event horizons for a more fantastical, and intriguing effect.