2. If 'space' is expanding , then that begs the question of; what is beyond that expanding wall or edge. It would by logic require something beyond that space is expanding into. Or it would require space by itself to be self creating. Neither conclusion is particularly a logical conclusion, and therefor it is an illogical premise to adhere to.
A finite limit to space is not an illogical premise.
Q. What happens to time when approaching a Black Hole?
A. Time speeds up. (relative to a more distant observer)
Q. What happens to distances when approaching a BH
A. They become shorter. (relatively)
Mass/Gravity DOES CREATE Space/Time
Now extrapolate what happens to the reverse. As Mass/Gravity becomes less dense, time slows and distances expand. If there was a Big Bang event that created Space/Time by introducing Mass/Gravity, Space/Time's size would be limited to the propagation of Mass/Gravity's effect (speed of light + expansion rate).
This explains why there is no edge to the universe, it ends at a single point that would take the age of the universe to cross.
The understandings we acquire on our safe little planet do not apply to the grandness of the cosmos, our Earthly perceptions do not make a good "measuring stick".
Nothingness is infinite outside the universe. No space, no time, no mass, no gravity.
Is there something else out there that the String (or M)- theory may project?
There is no way to know (yet).