I got an exam tomorrow and while i was studying, this popped in. Is there a gravitational potential inside a mass (eg : 500 km deep from the earth surface)? We can calculate the Gravitational field intensity inside a mass by taking the distance from the center to that inner-point as x and calculating the mass within that radius; then taking that calculated mass into the G.I = -GM/x2 Can we do the same thing to calculate the potential? I googled and those graphs showed a similar behavior, we get as the potential inside a conductive sphere. Why can't us calculate it like that above method? I only understand GCE A/L by the way.