+Planck units are a system of [natural units](/wiki/natural_units) defined solely by fundamental physical constants, representing the "natural" scale where current physics theories might break down. These units, like [Planck Length](/wiki/planck_length) and Planck Time, are thought to mark the smallest meaningful scales in the universe, bridging [quantum mechanics](/wiki/quantum_mechanics) and gravity.
+## See also
+- [Fundamental Constants](/wiki/fundamental_constants)
+- [Quantum Gravity](/wiki/quantum_gravity)
+- [General Relativity](/wiki/general_relativity)