but vacuum as infinite space exists.
Isn't it difficult (impossible?) to talk about infinity
without constraining it within finite terminology.
To convey our meaning we have to use terms like
"infinite space" and "infinite time";
yet space and time are incompatible with infinity.
We try to get our heads around the concept,
but we will always be like flatlanders trying
to describe a passing spider.
Of course, to explain infinity we need finite terminology
We have two conception on space and time:
Newtonian and Minkowski.
The space around us is Newtonian –
Descartes coordinates plus time ( 3D+ time).
Minkowski space is negative 4 – dimensional,
( Pseudo – Euclidian space ).
This space is absolute different from Newtonian space
because there the time cannot be separated from the space.
Herman Minkowski said about this spacetime continuum:
“ Henceforth, space by itself, and time by itself,
are doomed to fade away into mere shadows,
and only a kind of union of the two will
preserve an independent reality.”
So, ‘ space by itself, and time by itself ‘
( it means Newtonian space and time) are shadows.
What ‘only a kind of union of the two’ is reality?
What does union of spacetime mean?
Why only this union of spacetims is real factor in Universe?
Nobody knows what Minkowski space really is,
nobody has answers to these questions.
Maybe because we cannot answer to these questions our
finite terminology, trying to explain infinity, doesn’t work.