Some time ago, speculating on what makes motion (changes in distance between objects over time) possible, I realized that if space/time is as continuous, as, say, the mathematicians' number line (where between any two points, no matter how close, there is always an unlimited or infinite number of points between them), then motion would not be possible.
At some point there has to be a unit of un-divisibility (I wouldn't say "indivisibility"), where space-time is quantized, meaning that there are no "points" between two points that are only separated by this unit -- "travel" between units at this level would be a matter of one unit of time and units of space being movement -- in jumps where there is no jump involved (confusing, I know -- just ceasing to exist in one spot and beginning to exist in another).
It seems likely that this unit would be the Plank space-time. In true nothingness, where there is no space-time, there would be no motion, no distance, no time (so saying such a thing "exists" is incorrect -- the concept of before and between would be meaningless). There was no "before" space-time," nothing "outside" space time (even if space-time is finite), and nothingness between the units of space-time.
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