The universe may contain hidden dimensions beyond the familiar three spatial dimensions from "summary" of The Fabric of the Cosmos by Brian Greene
In probing the depths of reality, scientists have found evidence to suggest that our familiar three spatial dimensions may not be the whole story. The possibility of hidden dimensions lurking beyond what we can perceive with our senses is a mind-bending concept that challenges our understanding of the universe. The idea of extra dimensions may seem far-fetched at first, but the mathematics of modern physics actually support such a notion. These hidden dimensions, if they exist, could be compactified or curled up in such a way that they are invisible to us in our everyday experiences. They may only reveal themselves at scales much smaller than what we are accustomed to. One of the most influential theories that predicts the existence of extra dimensions is string theory. According to this framework, the universe is not made up of point-like particles, but rather tiny, vibrating strings. ...
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