Stars and most planets use meshes, but a few planets just use nullMeshParticleEffect's...magnetic clouds, plasma storms, and wormholes would be examples of planets that don't use meshes...

You would need a "null" mesh essentially that has "nothing" to it other than labeled "points"...one of these points would need to be either a flair or some ability point...a possibility might be to make the wormhole null particle effect act as a flair on the "null mesh" you made...you also could use a passive ability on the wormhole star that makes the wormhole effect occur...