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I'm not a physicist, but I suspect that one reason why physicists are reluctant to talk of a moment in time is that it is not an exact term. Another is that, in physics, "moment" has its own definition that is not quite the same.When you talk of a moment in time, do you mean "that infinitesimal point of time that is the present", or were you thinking of a definable period of time, as in: that was the moment at which it happened?
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"A moment in time" can be defined for any set of observers sharing a single reference frame... a static system with no movement or acceleration. Einstein proved that there is no such meaningful concept for the physical universe, this is called "non-simultaneity".
Before our universe emerged out of the primordial singularity, time did not exist,
After all if time did not flow, then, the primordial singularity, was stuck in a "moment"
The expression "A moment in time" does it exist in physics?