I;ve heard 2 different things, and onw says that the strong force is mediated by the gluon, but also, I've also heard that it is mediated by pions. The strong force, AFAIK, is actually caused when the 3 quarks in a hadron, continually exchange gluons with each other. And if a red quark, emits a red-anti-green gluon, its neighbour, say a green quark, changes into a red quark, while the emitter changes into a green quark. So, this goes on and on and on, and somehow creates the strong force, this strong force, is yea, kinda strong, so it actually seeps out and there's a residual force holding the nucleus together. Is my understanding right on this one?? And as for pions, which are mesons, how does it actually mediate the strong force? Is any one theory false? or is both of them somehow related?