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similar in the Minkowski metric It's not exactly the identity but it is used for flat Euclidean space time in four gravity is some magical force between two objects that happens over a distance But now we say there is no force. It's just the curvature of space-time So like when you throw a ball through the air, we like to think it's accelerating downward due to the force of gravity countdown keto
But Einstein said this is the wrong way to look at it. In fact, since there's no force We can say the object is moving along a straight line in space-time Well, this may sound crazy This comes from



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