1. The problem statement, all variables and given/known data A spaceship makes a trip from the earth to the moon 380,000 km awawy. at what point in the trip will the gravitational field be zero ? the mass of the moon is about 1/81 that of the earth 2. Relevant equations Fg = Gm1m2 / r^2 3. The attempt at a solution ummmmmm i know that the distance is 380,000,000m the mass of the moon is 1/81 of the moon the mass of the earth, but i don't know any equation which will give me a gravitational field of 0 and i don't know the mass of the spaceship......... what do i do??