I must talk fast, before computer gets the hickups again. To the best of my understanding, space and time and even gravity are not things in the same way matter and energy are things. Space and time are both relationship of mass to other mass, space is the nothing between areas of mass and time is the relative changing positions of units of mass to one another, both are defined by mass but are of themselves not comprised of mass. Gravity, as I understand it, is the effect side in a chain of cause and effect of motion taking place within any unit of mass and its resulting effect on other mass. Put space and time together, put ;it in the oven at 350 degrees for 20 minutes, and you have baked a cake called "gravity". Space is the flour, and time is the yeast. In other words, time is the active ingredient. If you remove all space between mass you have neither space nor time. But if it was possible to stop only time, you would still have space. The infinitly small and dense singularity could just as easily be called infinitly large, because with nothing else to compare it to, the size of that point is irrelevant. Technically,, it have no size, since nothing yet exists to compare it to, at least not until chunks of matter are realised shortly after expansion occurs. Anyway, none of this is my area of expertise, but it is fascinating to think about. I am; retired, or unemployed (I haven't decided which yet) so have much more time to get lost in thought (lost in space?) over this.