1. The problem statement, all variables and given/known data A planet of mass 1.88x10^21 kg has a moon of mass 4.56^10^19 kg. The distance between their centers is 3.94x10^8 m. How far from the center of the planet (along the line joining the planet and the moon) is the net gravitational field strength, due to the two bodies, equal to 0? 2. Relevant equations Fg = GMm/r^2 3. The attempt at a solution GMm/r^2 - GMm/r^2 = 0. Somewhere in there I'm thinking I can put in the point (x) but I have no idea where or how to approach this.