Pgottsha84 said:
I was watching a discussion from the world science festival and the astrophysicist who I unfortunately can not name had what he explained as the shape of the universe over time and it was a pointed bell on it's side, the point referring to this singularity.
You're likely referring to this picture, or some variation thereof:
The spatial location of the point at the apex of the bell is roughly where were are now. Any sufficiently distant observer is now and has always been separated from where we are or have been. Even though this separation goes to 0 in the limit as you roll back the time (that's why it's a singularity), it always stays separate.
Another observer, some distance away, could draw an identical bell, but with them at the centre:
And so on for infinite number of observers.
The image of Big Bang you're stuck on is that of a point-like explosion, with debris flying apart in the shape of a spherical expanding shell. That is not the right image.
Try this:
Start with the current universe, and extrapolate backwards in time.
For the sake of argument, let's assume the universe is infinite in extent - you can keep jumping to neighbouring galaxies without limit. There are galaxies distributed pretty much uniformly throughout, with no significant voids or clumps - this is what observations indicate, so you know you're on solid ground.
Now begin rolling back the time, and contracting ALL distances by the same factor per unit of time. No matter between which two galaxies the distance is measured, it has to go down by the same factor. E.g. both a galaxy 4 billion light-years (Glyr) away from the observer, and one 2 Glyr away will have their distance to reduced by half after the same amount of time.
From any given galaxy on which you're standing at the moment, it'll look like all other galaxies are approaching towards you, with farther galaxies approaching faster than the closer ones.
As you keep rolling back the time, all the distances keep contracting, even though the universe stays infinite, and all the galaxies remain in the same relative positions (a galaxy at your 2 o'clock will stay there, even though it's getting closer). The further back you go, the more dense universe is, but the distribution of matter still remains just as uniform as it was when you started the process of contraction.
At the limit of some finite point in time, all the distances approach zero - this is the singularity. It's a point in time at which the function used for describing expansion becomes singular - it stops being defined (much as f(x)=1/x is singular at x=0), results in infinities, and can no longer be used in a meaningful sense (so we don't treat it as meaningful, and stop using the BB model before we reach that point).
It's not a point in space. In fact, if the universe is infinite, it stays infinite throughout the process of contraction, including at the singularity.
Expansion is just that, but in reverse.