[Alneyan]

Note that a Nebulaa Destroyer will only remove the Nebulaa; you will not have a sun in the system in question. If the nebulae *happened* to have been created by a Nebulae Creator, you will have to create a sun before being able to remake your planets.

While on this topic, Black Hole Creators destroy everything in the system, wormholes excluded. So if you had twenty huge breathable planets in this system, they are gone, even if you collapse the Black Hole later on.