String theory proposes vibrating strings as fundamental from "summary" of The Quantum Universe by Brian Cox,Jeff Forshaw
In the strange world of quantum mechanics, where particles can be in multiple places at once and exist in states of superposition, physicists have been searching for a theory that can unify the forces of nature. One of the most promising contenders for such a theory is string theory. At the heart of string theory is the concept that the fundamental building blocks of the universe are not point-like particles, but tiny, vibrating strings. These strings are incredibly small, on the order of 10^-35 meters in length, making them far beyond the reach of any current experimental technology. Despite their size, these strings are believed to be the key to understanding the fundamental forces of nature. Different vibrational modes of these strings correspond to different particles, giving rise to the various particles we observe in the universe. One of the key features of string theory is that it requires extra dimensions beyond the familiar three spatial dimensions and one time dimension. These extra dimensions...
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