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Planck Time




t_P = \sqrt{ rac{\hbar G}{c^5}} \approx 5.391 × 10−44 Second s

where:

:\hbar is the reduced Planck Constant (or Dirac's constant)

G


c


The Planck time is the time it would take a Photon travelling at the speed of Light to cross a distance equal to the Planck Length . However, this may not be taken as a "quantum of time". Within the framework of the laws of physics as we understand them today, we can neither measure nor discern any difference between the universe at the time it first came into existence and the universe anything less than 1 Planck time later.

The estimated age of the Universe (4.3 × 1017 s) is roughly 8 × 1060 Planck times.


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