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Is Newtonian Gravity Really Different?
In Newtonian physics, as well as space and time, you've got the idea of a force. A force is something that pushes objects around and makes them deviate from straight line paths. Now, in the Einstein picture, for very good reasons, that's reformulated. Forces are not real. What is real is a curvature of space time, the sagging of your sheet. That's what you perceive as a force - an illusion created by the geometry of space and time.