So like, is the 3000 worlds a single Ultra World that is made up off 3000 smaller worlds?
Those things spat out from the furnace were individual planets, but the 3000-worlds is made up of 3000 planets and hundreds of domains, each one is like a mini galaxy with about a dozen planets in it, with only way to access other mini-galaxies being portals.
Is 3000-worlds made up of 3000 individual planets born from the furnace that merged together?