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[ IMHO, many have perceived the cosmos in terms of infinity (no boundaries) whereas the void of cosmology is null. ]

Got a question.. If space is null, empty.. then what is it.. it has to be something.. even nothing is something.. What is it?.. How can empty space be nothing at all.?. maybe its the same stuff thats between "atoms".?. That is if there even a thing called atoms..

Thank you for your question!

Got a question.. If space is null, empty.. then what is it.. it has to be something.. even nothing is something.. What is it?.. How can empty space be nothing at all.?. maybe its the same stuff thats between "atoms".?. That is if there even a thing called atoms..

Empty space is not null - nor is it empty. It has geometry and it is a vacuum. Moreover, virtual particles come into and out of existence in a vacuum.

Empty space is like a quantitative field in a fixed length record which contains a zero. Void would be if the field did not exist at all.

The thing to remember is that space/time is created as the universe expands. It doesn't pre-exist. Space/time doesn't expand "into" anything.

The condition which exists before the beginning of space/time (regardless of cosmology) is the void.

Thank you so much for your reply!

Got a question.. If space is null, empty.. then what is it.. it has to be something.. even nothing is something.. What is it?.. How can empty space be nothing at all.?. maybe its the same stuff thats between "atoms".?. That is if there even a thing called atoms..

Indeed empty space is not nothing. It is a vacuum which is theoretically possible to achieve. And space is not null, it is the geometry.

That jar on earth is full of air or ordinary matter which comprises 5% of the critical density of the universe. If you removed the air, it would be a vacuum which occupies the space defined by the coordinates of the jar itself.

If you were to fill that jar in the middle of the Milky Way galaxy, it would be full of dark matter (25% of the critical density). If you removed the dark matter, it would be a vacuum which occupies the space defined by the coordinates of the jar itself.

Likewise, if you were to fill that jar in the darkness of space, it would be full of dark energy, the remaining 70% of critical density. But it would not be a vacuum until you removed the dark energy.