In relation to two objects with a gravitational field on them (i.e. a planet and its moon), would there be two pairs of partner forces (the force of gravity exerted from each object and the resulting partner force from each force of gravity)? For example with the earth and moon: 1. Force of gravity exerted on the moon by the earth = - Force exerted on earth by moon 2. Force of gravity exerted on the earth by the moon = - Force exerted on moon by earth Or is the force of gravity exerted by the moon on earth = - force of gravity exerted by the earth on moon? My intuition would say my first answer is correct?