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I was pondering some freshman level physics, the other day, and I noticed something. According to Newtonian gravity, the force of gravity is zero in the earth's center of gravity. This is due to force vector addition, The force of gravity on one side of the earth, cancels the force of gravity on the other side due to opposite vector directions. The force of gravity is highest on the surface in terms of vector addition. That being said, when you look at pictures of space-time wells, derived from General Relativity, space-time is most contracted in the center of gravity, where Newtonian gravity says gravity is equal to zero. The center of a black hole, if we assume spherical, has zero gravity, yet, this defines the deepest part of the well. Although space-time wells, do not correlate with Newtonian gravitational force, it does correlate with gravitational induced pressure, which is force/area. The pressure in the center of the earth is highest even though the gravity vectors add to zero. This is also the place GR says has the most space-time contraction. So is space-time contraction a function of gravitational pressure?This is useful because pressure is key to phase transitions of matter and it takes into account material density which can vary from atom to atom. This allows GR to theoretically extrapolate and correlate material phases and entropy. It also explain blue and red shift in another way. For example, the core of the sun has the most energetic energy quanta in the core, due to the core material phases induced by pressure. As we go to the surface, phases change, due to the pressure drop and the energy of the average photon "red shift", relative to the core.

This is also the place GR says has the most space-time contraction.