Ptr1c and lostclimate

The theory of relativity can provide an answer to your questions
I do not mean I grasp the theory , of course
You ,same as me and anybody else and Newton too, assume that space is a sort of empty box
The universe is expanding inside the box but where are the boundary lines ?
According to Einstein it is not like that
Space(and time)can not be separated from matter
If matter does not exist then also space and time do not exist
However I dont'think, as far as I know, that the theory of relativity can answer my original question.
Not only, Einstein himself realized that it was a key issue
He did what a scientist should never do
He introduced a "constant" in his equation to "force" the universe to be "stable"
No beginning, no end
But some years after the expansion of universe and the big bang have been proved beyond any reasonable doubt