I'm just a humble human being here, so if my question comes across as stupid, please forgive me! :) Newton's Third Law of Motion states that for every action there is an equal (in magnitude) but opposite (in direction) reaction. One of my A-level revision guidebooks state that the attraction forces between the Earth and the Moon is an example of an action-reaction pair. However, isn't the Earth's gravitational force greater than that of the Moon? Does Newton's Third Law of Motion apply to every situation, if so, why does resultant force still exist since every force produced will definitely bring about a reaction which is equal in magnitude and opposite in direction?