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Planck Time
Planck time (tP) is the natural satuan waktu in the Planck system of units, kira-kira sama dengan 5.391 × 10⁻⁴⁴ seconds. It didefinisikan sebagai the time required for light to travel one Planck length in a vacuum and represents the scale at which quantum gravitational effects are believed to become significant. Below this timescale, current physical theories are not expected to remain valid without a theory of quantum gravity.