I am sure most here are familiar with it Fg = G*m1*m2/d^2 With this formula, if one were to venture to the centre of the earth, the distance between he and the centre of the earth == 0. Therefore we get the bottom equal to 0^2 or 0. If we then continue we get an undefined answer. Certainly the gravitational force between the earth and a body and the centre of the earth is not infinite or else everything would collapse inwards towards the centre. So does this mean the gravitational force between the earth and a body at its centre is Null and void, or in other words equal to 0? Please excuse my ignorance; I am very new to this.