Rainbowcosmos is a verse that has most color in it has full saturation (no grays, blacks or white). This is achieved by having Megaelectrons and Megaphotons in the core, and having the more energetic regions cycle around every 5 minutes. Electromagnetic radiation is released as light, and constantly changes frequency as the energetic regions cycle around, forming a rainbow effect.
In all the planets of the Rainbowcosmos, 61% of the planets with life (50.63% of all its planets) can have rainbows. And only 3.(1/9)% have eternal rainbows.
Inside there is only 1 barrel at the center.