[Sir Kenyth]

First point. Absolute zero is to the low end of the physical spectrum as infinity is to the high end. An unattainable reference point. Getting to absolute nothing is as infinite a task as reaching infinity.

I don't think there is such a thing as a single point of no mass in our universe any more than there is a single point of infinite mass. Just because we haven't discovered particles smaller than photons does not mean they don't exist. Just that we cannot detect them. There may well be particles to whom our densest material is completely permeable. I feel there are just different levels of the presence of matter throughout every square inch of the universe. Therefore, without matter to define it, space does not in effect exist! You cannot travel outside our physical universe as your very presence as matter would define where you were as part of the boundaries of our physical universe.