Planck time
Physics
noun
1The time (ℏG/c 5)½ (where G is the constant of gravitation), or 5.39 × 10−44 second, after the big bang.
2A unit of time of this duration (equal to the time that light takes to travel the Planck length).
Origin
1970s; earliest use found in Nature: a weekly journal of science.
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