In physics, the Planck length, denoted ℓP, is a unit of length, equal to 1.616199(97)×10−35 metres. It is a base unit in the system of Planck units. The Planck length can be defined from three fundamental physical constants: the speed of light in a vacuum, Planck's constant, and the gravitational constant.
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“Oft have I mused, but now at length I find,
Why those that die, men say they do depart.”
—Sir Philip Sidney (1554–1586)
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