I am writing a science fiction book, and have had a lot of fun writing it so far. However, I am facing a technical astronomical problem right now that I would appreciate some advice concerning: I am looking for a plausible scenario in which one of a pair of "fraternal" twin suns is about to destroy a planet containing intelligent life. However, an astronomical event occurs which prevents this. I was thinking of the danger to the planet coming from one of it's twin suns entering the supergiant phase, or being about to go supernova, but this being prevented by the formation of a plasma bridge. Is very close proximity the only event which could trigger the formation of a bridge like that? Also, while I would prefer for the planet to be in the habitable zone of the same solar system as the twin stars if that were possible, it could be in a neighboring solar system instead. Any guidelines or advice that any of you could share with me would be much appreciated.