Does the Hubble tension prove the Earth is at the center of the universe?
A viewer notes that in trying to figure out the Hubble tension, scientists found that the farther from Earth the stars are, the quicker they are moving, and asks whether this proves geocentrism with the Earth in the center.
Answer
First understand why there is such a thing as a Hubble tension. If you dream up a universe that is only a balloon surface with nothing in the middle, and you put all the galaxies on that surface and have them expand away from each other, you can explain how we see a redshift from each galaxy, because stretching the galaxies apart stretches the wavelength of the light toward red. But then the question is how fast it is expanding: you cannot have it too slow, because you will not see enough redshift, and you cannot have it too fast, or you will outpace the light and see no redshift. That is the tension, and finding that exact expansion speed is like trying to balance a pencil on its point; it falls every time. Men have spent their whole lifetimes trying to find that number and cannot, which tells you the whole thing is bunk. When Hubble saw a redshift from all the galaxies in every quadrant of the sky, he knew instinctively that the Earth was in the center, because if the Earth were not in the center you would see blue shifts as well as red shifts in the distant galaxies, and you do not. The only way he could get out of that was to take the center away: replace Euclidean geometry with two-dimensional Riemannian geometry and put everything on the surface of a balloon. So the Hubble tension does not prove anything by itself, but the redshifts seen in every direction do point to the Earth being at the center, which is exactly what the balloon model was invented to escape.