Asolar system has the five planets shown below. the mass of each planet is proportional to its size. planet x is at equal distance from planet a, planet b, planet c, and planet d. which planet exerts the greatest gravitational force on planet x? a. planet a b. planet b c. planet c d. planet d

The answer would have to be C because of the mass of the planet, some people would say that is not exactly true in a lot of cases but in your problem the planet with the most gravitational exert would have to be planet C .One last thing you should know...'the Universal "LAW" of gravitation'. Laws/Principles can only be verified and cannot be proved. Laws are conclusions based on experiments.