Planck length

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The Planck length is a very small unit of length. It is is calculated from three physical constants: the speed of light, the Planck constant, and the gravitational constant.

It is about 1.6 x 10−35 m or about 10−20 times the size of a proton. It is one of the Planck units, defined by Max Planck. It is an important length for quantum gravity because it may be the size of the smallest black holes.[1]

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