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A graviton is a hypothetical particle that carries the gravitational force. The particles themselves only exist at the most fundamental of levels. They are smoky, referencing the fact that particles do not have a defined location or momentum (Heisenberg's Uncertainty Principle). 

Where FoundEdit

They are found inside the Quantum Level .

Other InfoEdit

A graviton, if it exists, would have a cross section many times larger than the Planck Length. A graviton would not exist on the Planck Level because the strings, which make up gravitons and all other particles, are on the same level.