Define "margins".
It's it the matter space and time that is the farthest from the Earth? Are we back to the Earth centric universe?

Part 1: Margins, in my model, is the absolute “edge” of the universe, where the universe we know is being continuously created and is expanding into the “nothingness” that is there. Hmmm. Not clear.

OK. Imagine a tsunami wave expanding over a perfectly flat plane. Forever. The wave is the edge, and everything behind it is wet while everything in front of it is dry. That’s the margin. The tsunami is the manifestation of the energy; it’s not actually the water or the sand, it’s whatever it is that causes this “thing” to happen.

The trouble I have with the Big Bang is that with that model it all had to happen once. That’s a helluva explosion/creation, but by everything we know there is nothing that makes the explosion gain energy as it continues. Yet space is expanding; the galaxies are flying farther and farther apart. A single cosmic event doesn’t work that way, at least none of the others do (black hole, pulsars, neutron stars, X-rays produced by other cosmic events.) They happen, they travel, but they don’t speed up.

(I have considered “the expanding balloon” hypothesis, but that would require some gigantic cosmic force to keep pushing from the inside , for which we have no evidence. I know, I know, dark matter blah blah blah. I’ll believe it when I see it. I prefer my “cooking at the edge and pulling it outwards.” Probably just me.

Part 2: No, the earth could be incredibly close to one of the edges (but the edge still be out of sight, or at least unseeable now with our current technology, or possibly forever if it is expanding at the speed of light or has some other natural phenomenon going on.) There is nothing that says the earth should be in the center; indeed looking at the vastness of the universe we are able to detect it seems very unlikely that that would be the case.