Alex,
Interesting topic of discussion.
The sum total of all we see originated from a singularity after the Big Bang. Before the Bang, outside (whatever that means) of this singularity there was nothing- no matter, space, energy or time. This was truly a void.
Now, there are no voids. Any cubic volume of space at any time will have a measurable amount of mass or radiation (don't ask me how to measure it). Indeed, space itself may be related to energy in a similar way as mass is related to energy. After all, mass modifies space so it must be energetic.
Regards, Rob
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