I invite you for an updated and review discussion of the one and maybe the most fundamental IMHO question of modern physics in general today, what really is vacuum space?

It can hold the key for answering puzzling questions like dark matter and dark energy which GR and SR seems unfit to give.

What is it really? Can it be an unknown exotic phase of matter-energy? Or is it just an empty space between matter and in which energy propagation occurs?

However to the last argument vacuum quantum foam indicates otherwise and suggests that it is actually a physical fizzling medium.

Quantum field theory (QFT) suggests that it is a collection of overlapping and interacting omnipresent fields but then again what generates these fields in the first place. Field on what?

Maybe we are the same as fish in water which do not know that they are inside water?

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