Void is a relative matter. Something can be void only in respect to a particular thing. A room can be void of air, but there can be light. A space can be void of matter, but can have energy field. To say something is void, one must specify what it is void of. Since there no global finite list of all things, there can not be any space or anything that is completely void. There will always be something that it is not void of.
An empty space in this universe is void of many things including matter, and energy (if we relax the quantum fluctuations). But it is not void of space for example. Similarly whatever was before big bang or is outside the scope of this universe is void of space and time as well. And that's pretty much the last two things we can think of releasing from our idea of something at least being there. But since we do not have a global list of all possible things, that outside of universe is not void of everything. There could be something in there and still be counted as perfectly void for our world.
An empty space in this universe is void of many things including matter, and energy (if we relax the quantum fluctuations). But it is not void of space for example. Similarly whatever was before big bang or is outside the scope of this universe is void of space and time as well. And that's pretty much the last two things we can think of releasing from our idea of something at least being there. But since we do not have a global list of all possible things, that outside of universe is not void of everything. There could be something in there and still be counted as perfectly void for our world.
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