This model does assume the big bang happened in a spheroid pattern. It’s just flattened to add time as an axis from left to right cause you couldn’t represent time otherwise.
The universe expanding means it gets sparser. It has no edge and no center, so it’s not spherical. It’s either infinite or repeating (e.g. it might be the surface of a 4D torus, but as said: that doesn’t imply an edge). I personally believe it’s infinite and not repeating.
You could represent time as the distance from center to circumference, although that wouldn’t be as readily comprehensible at a glance. It’s more like the image just shows a chunk out of that sphere
This model does assume the big bang happened in a spheroid pattern. It’s just flattened to add time as an axis from left to right cause you couldn’t represent time otherwise.
The big bang didn’t happen in a pattern, it happened everywhere at once: https://nasaspacenews.com/2025/10/is-the-universe-infinite-new-evidence-challenges-our-cosmic-understanding/
The universe expanding means it gets sparser. It has no edge and no center, so it’s not spherical. It’s either infinite or repeating (e.g. it might be the surface of a 4D torus, but as said: that doesn’t imply an edge). I personally believe it’s infinite and not repeating.
You could represent time as the distance from center to circumference, although that wouldn’t be as readily comprehensible at a glance. It’s more like the image just shows a chunk out of that sphere