Einstein attempted to create a version of Newton's theory of gravity compatible with special relativity but found it impossible, which forced him to realize that gravity is not a force on top of spacetime but rather a feature of spacetime itself—specifically, spacetime geometry that is curved and dynamical, responding to the presence of mass and energy.
causalpending
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Sean CarrollEvidence Quote
“Einstein comes along and says, 'Well, okay, can I make a version of Newton's theory of gravity that is compatible with my new theory of special relativity?' And after trying, he said, 'No, I can't. You have to do something much more dramatic.' And what he realized is that gravity is not a force on top of spaceime. It's a feature of spaceime itself.”
Created: 8/11/2026, 7:47:10 AM
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