Newton postulated a law of universal gravitation according to which each body in the universe was attracted toward every other body by a force that was stronger the more massive the bodies and the closer they were to each other.
I have never seen "which" which is used after "according to." I've consulted a dictionary and reasoned that "which each body" means "every body." Is it right?
I completely don't understand why the phrase, "the more massive the bodies" is right. I think it must be "the more massive body."
Tell me, please!