Tell me this: Did the entire universe that we know today expand from a
point? What is it exactly that is expanding? I visualize it as light
from the early universe radiating out, pushing the frontier in all
directions, creating new space, as we speak?

Errol Not that this answers your question, but I'd like to interject my
"perspectives", since you are "visualizing".
1) We can only measure so far. Therefore at some point we reach that limit
in all directions, and that defines a sphere.
2) #1 doesn't necessarily define the shape, origin, or expansion of the
universe.

Steve,

I might as well explain in a little more detail what it is I do
visualize. And please, try not to laugh....

First I'd like to state that what I am going to describe will be
described from a perspective that did not exist. I state the obvious
only because earlier, Greg shot me down for my metaphor about a guy
watching the big bang expand. He quickly stated that such a condition
was impossible. Of course I knew that I was only trying to conduct
a little thought experiment. Much the same, the analogy of the
balloon. After all, people cannot exist as 2D creatures right? That's
the equivalent of starting a metaphor with, "assume a cow is
spherical."

I visualize some event taking place and the first particle coming
into existence . Perhaps it be the very first quark only moments after
quark confinement. At this point, space does not exist. The way I see
it, space will come into play after the second particle forms. At
this point, one could say that there is space between the two
particles. Or, one is here and the other is there. Again, I know there
are no eyes to see it. Heck, there are probably no photons....

At this point, time does not exist yet. Time will become noticeable
once the third event takes place because at that point, an observer
could say that the time between the first two events create the first
unit of time passage. The observer now has a reference.

After the dark period (got that from an October 06 Time Magazine
issue), I visualize radiation spewing in three dimensions. By
radiation, I mean light of every imaginable frequency, and other crap
that I wouldn't dare try to pronounce. I imagine that it is not
homogenous. I imagine that mass is not evenly distributed, therefore,
gravity will limit expansion accordingly. I imagine the wave front
encompassing my observer in my though experiment. He is now in the
suddenly in the universe. Now he feels like he is being tugged on by
gravity, light is shining in his face, he is in the universe as we
know it.

Bottom line is that in my mind's model, there is no other stuff.

I'm going to stop here so that you can all take a break. Give your jaw
and stomach a rest.

Errol