I made some tests with stellar manipulation and here is the result. Stellar Nucleonic Torpedo and Nucleonic Thresher Torpedo both destroys a star and all ships plus planets are changed to asteroids. Furthermore Nucleonic Thresher Torpedo creates a nebula to the system. Inverted Quantum Beam collapses a star and the result is a black hole. Like the component description says it destroys everything in the system but warp points so there's no way to get back those planets which were in the system.
Actually the only new thing here is that the Nucleonic Thresher Torpedo (creates nebula) doesn't completely wipe off planets but turns them into asteroids
