Kaluza-Klein theory is a theoretical framework that attempts to unify gravity and electromagnetism by extending the concept of spacetime to include extra dimensions. It originated from the work of Theodor Kaluza and Oskar Klein in the early 20th century. The key idea is as follows: 1. **Extra Dimensions**: Kaluza proposed that, in addition to the familiar three spatial dimensions and one time dimension, there exists a fifth dimension.
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