When you look at stars and galaxies, are those furtherest away actually near the edge or simply older? Are you looking away, or back in time? Is there any reason to think we are not on the edge of what you call the bubble?
There are stellar cartography maps that attempt to provide Cartesian coordinates to the stars and galaxies we have been able to map out so far. The have been done by measuring radiation, light, and other visible and non-visible wavelengths. They approximate the extent of our big bang’s expansion to look something like an oval or oblong spherical shape.
A) Big bang whatever it was began to expand
B) Big bang continued to expand
C) You and I have let others measure and map its expanse
D) They draw a picture
E) We look at picture
F) Picture has an approximate edge or boundary
Is this the edge of the matter that was once contained in our point singularity or only the edge of that part of the original matter we are able to measure or detect? Not having first hand access to the actual data I must assume that what they have mapped out is what they believe to be the matter that was at one time contained in our big bang singularity or they would not have been so quick to make it an oval. The fact that others have placed a boundary on what they have mapped out and it is not a perfect sphere leads me more towards our ability to measure the extent of our big bangs expansion and not our inability to measure the extent of our big bang expansion.
So I submit that farther does mean older and YES what we see is looking far back in time but relative to our time right now that puts these older objects at the edge of the POST created by our big bang.