I was reading an article about neutrinos in a Science Illustrated magazine about a month ago. And in this article it stated that when a neutrino collides with another particle, you know the direction from which the neutrino came from and the flavor of it. A neutrino is a non-charged, non-zero massed particle right? And objects that have mass, whether it be negative or positive, are affected by gravity. If a neutrino is affected by gravity, and in this article it states that they are, then it should be impossible to know which direction the neutrino comes from. The neutrino could slingshot around billions of particles before it collides. You can infer the direction of the neutrino by the initial and final velocities. Yet you can't get a truly accurate number. Is it really possible to know the true direction a neutrino came from? Thanks!