I was thinking of the conditions exerted at the center of our Earth. If a man let's say in America falls toward the Center of the Earth and a man on the opposite side of the Earth falls, where would they meet? I read that the gravitation force at the center of the Earth is at 0. If they both fall towards the center, what would be the force that keeps them at the center? Would they even be kept at the center radius? This is excluding external gravitational forces including orbiting planets and satellites. Why would the conditions reach to 0 and defunct freefall speed? After all an object that stays in motion stays in in corresponding motion. There would have to be another force to repel the gravitation G that is lost to reach a state of 0. Hence, mathematically for the scenario we seem to run into a problem. You cannot take away 1G from a force without losing it in another place. I keep concluding an opposite reaction or negative reaction to gravity. Maybe gravity has an opposite. Can that be possible? If gravity cannot have a negative connotation, can Stephen Hawking's theory of microscopic wormholes have anything to do with it stating that another gravitational force can be exerted through a wormhole like phenomena at the center of any gravitational body. I also read in astronomy, that matter that is destroyed into a black hole is refracted back into the universe. In other words there is no energy lost into the black hole itself. The black hole just dumps back all the matter and energy back into the universe it doesn't absorb it. That defers any theory about black holes leading to parallel universes and dimensions and making black holes volatile. I also run into a problem. If black holes are volatile that would make gravity volatile. But that cannot be if gravity seems to have set rates known as freefall. If anyone is considering why I consider black holes as volatile, that is because black holes would break apart a star and spit the energy back out. To spit back the energy and matter of the star, the energy must have hit a snag in the black hole maybe a repelling force or the gravity in the black hole itself must be shifting to return the energy similar to what the stomach does when it's upset. Just like the stomach would be volatile, the black hole is as well. But just like the stomach's acid or the body's refusal to gorge, there must be a reason why the black hole refuses to absorb the energy or matter. I also run into a problem. There are theories stating that a black hole would absorb another black hole making the black hole massive or more massive. The black hole absorbs and repulse. But why? These are just theories but gravitational bodies seem to mysterious.