By examining the results from experiments in colliders,physicists have leared that protons are composed of even smaller partices:a blue quark,a red quark.and a green quark,all connected by gluons.(Quarks aren’t actually colored-that is just the naming system that physicists use.) In the illustration,two beam of protons are smashing into each other.The resulting high-energy collision produces other particles.To date,57 types of particles have been detected.