The Planck scale is the microscopic limit of our universe, defining a boundary where our current laws of physics—specifically quantum mechanics and general relativity—break down and must merge into an undiscovered theory of quantum gravity. It represents extreme physical limits: the shortest possible measurable distance, the smallest unit of time, and energies so high they defy modern scientific observation.
To understand this mysterious boundary, physicists use “Planck units”—a system of natural measurements derived entirely from three fundamental constants of nature: the speed of light ©, the gravitational constant (G), and the reduced Planck’s constant ( The Core Units Three primary metrics define the scale:
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