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May I pose a question that a student might ask if presented with this interaction approach? Consider the sun and one of the planets. In the usual approach to fields at the introductory level, we consider the planet to interact not directly with the sun, but rather with the local gravitational field it is imbedded in. In the sense of interactions obeying NTN 3rd, why is the force on the sun toward the planet considered the other interaction force? The planets are interacting with the fields, not interacting with each other directly (action at a distance.) I think this interaction approach gets a little fuzzy here.