If the expansion is not centered on the Milky Way, what describes the pattern observed from any other galaxy?
Answer
All other galaxies would recede from that location at a speed proportional to their distance, similar to dots on an expanding balloon.
The conclusion derived from the uniformity of Hubble's Law is that the expansion is non-centered. If we imagine the universe expansion using the analogy of dots painted on the surface of an expanding balloon, every dot sees every other dot moving away from it. Crucially, the farther any two dots are separated, the faster the distance between them increases. Therefore, if an observer were situated on any other galaxy, they would observe the exact same pattern: all surrounding galaxies receding from them at a speed directly proportional to their respective distances, confirming uniform expansion everywhere.
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