The philosophy behind nothingness and emptiness is not easily explained. I like to think that nothing exists...

The theory of relativity and laws of observation somehow helps to explain nothing to me in terms of something only existing when observed.

A void, on the other hand, or emptiness is also relative to the observer. To us, space is empty because we cannot observe or measure something definitively as being there. But that only makes it empty to us as the observer. Who knows what else is watching....