2.8.4: General Relativity (optional)
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What you've learned so far about relativity is known as the special theory of relativity, which is compatible with three of the four known forces of nature: electromagnetism, the strong nuclear force, and the weak nuclear force. Gravity, however, can't be shoehorned into the special theory. In order to make gravity work, Einstein had to generalize relativity. The resulting theory is known as the general theory of relativity. 5
Benjamin Crowell (Fullerton College). Conceptual Physics is copyrighted with a CC-BY-SA license.