# superstring theory

**superstring theory** Theory that attempts to explain the properties of elementary particles and the interactions between them. It combines quantum theory and relativity, especially to explain nuclear forces and the force of gravitation (*see* fundamental forces). Superstrings are hypothetical one-dimensional objects about 10^{−35}m long that require a 10-dimensional universe to accommodate them. Their use in quantum calculations predicts the existence of gravitons, the particles believed to be involved in gravitational interaction. Some scientists believe this theory could explain everything in the universe. See also unified field theory

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**superstring theory**