This is a layman question, so hold your temper. :) If gravity is the effect created by a mass that bends space time, how (in what fashion) does space time bend? I have seen it represented in 2d with a 3d sphere in the middle. But wouldn't spacetime be bended over the entirety of the mass (earth if you will)? Wouldn't a sphere envelloped in some kind of space time bubble be a more accurate representation of this?