I'm an physics fan and while reading about gravity in general relativity I came to this: It seems to me that both newtonian gravity and general relativity gravity have an "energy" problem. Using Earth as an example for simplicity: In newtonian gravity, the Earth applies a force on objects on its surroundings, accelerating them down. On general relativity, the Earth applies a force upward on the objects in its surface, accelerating them up and preventing them to follow their geodesic paths. In both cases, where does the energy for the forces comes from? In my classical way of thinking, any force would require a source of energy. If Earth is accelerating everything (up or down), it seems to me that it should be using some kind of energy as a source to create a force on the objects.