Gravity at the pole does not get stronger at the poles as the oblateness increases, it decreases, it just doesn't decrease as fast as it does at the equator. If we start with a uniformly dense Earth and squash it so that the polar radius is 1/2 the equatorial radius while maintaining a constant volume, the gravity at the pole decreases to ~85% of its former value, but the gravity at the equator decreases even more. If you reduce the thickness of the disk to zero, you have to expand the equatorial radius to infinity. An object an infinite distance away feels zero gravity. At best you can say is that as the oblateness increases, both gravity forces tend toward zero, but at different rates. Much like this graph of two functions. They both start at 1 (pole and equatorial gravity equal for sphere) Both decrease towards zero as X (the numbers across the bottom) increases towards infinity. (it may look like the red function reaches zero before this, but that is just due to the limitations of the graph's scale.) But in between the extremes, the red function always has a smaller value than the blue function. ( equatorial gravity remains less than polar gravity) Please Register or Log in to view the hidden image!