Copy pasted because I’m not smart enough to remember everything accurately.
Wikipedia:
There is no currently available physical theory to describe such short times, and it is not clear in what sense the concept of time is meaningful for values smaller than the Planck time. It is generally assumed that quantum effects of gravity dominate physical interactions at this time scale.
Forbes:
In order to measure anything at the Planck scale, you’d need a particle with sufficiently high energy to probe it. … If you had a particle that actually achieved that energy, its momentum would be so large that the energy-momentum uncertainty would render that particle indistinguishable from a black hole.
TL;DR:
Our current theories and techniques, and possibly physics, don’t let us clearly define anything below the Planck Scale
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