Quote Originally Posted by Falconius View Post
A curious question. Is gravity consistent to the object as a whole or does it change? ie if you go to the center of the earth is gravity weaker, or the same, or stronger? Does anyone here know?
Gravity itself remains the same, but the net force you experience is reduced as you descend below the surface. Essentially, all the planet above your level cancels itself out (this is easily demonstrated and is a standard first year college physics exercise). It is probably easiest to intuit by imagining yourself at the very center of the Earth. The pressure and heat are enormous, you die, no saving throw. Oh, that doesn't help. Well, assume we carved out a little bubble at the center where you can survive. The Earth is everywhere equally above you. Now, the force of gravity is pulling at you, but there is equal mass in all directions, so you are pulling equally in all directions, so it all cancels out. This is true anywhere inside a hollow sphere, as if you get closer to one side, the mass there pulls more strongly due to proximity, but there is now more mass on the other side pulling you back and this will cancel out (this is what the physics exercise involves demonstrating). Picture the solid ball of the Earth as a series of spherical shells. The layers below your depth pull you down, those above cancel themselves out. So you gradually feel less gravitational attraction to the center of the Earth until it completely disappears at the center.