To get an idea of what the Universe looks like from Earth’s perspective, picture a big watermelon. Our Galaxy, the Milky Way, is one of the seeds, at the centre of the fruit. The space around it, the pink flesh, is sprinkled with countless other seeds. Those are also galaxies that we — living inside that central seed — can observe through our telescopes.
What do the @physicists think about this latest claim from Nature.
It only looks geocentric because the author is using a typical physicist trick: change of coordinates .
We believe that the universe is largely isotropic (looks the same in all directions) and homogeneous (looks the same everywhere), so we are justified in choosing a coordinate in which the Earth is at the center. However, note that any other place can also be chosen to be the center.
Contrast this to geocentricism, in which only the Earth can be at the center.
I like it. It’s a cute analogy. Although, for philosophical/theological considerations, we’re less interested in things that the 21-cm radio waves can detect. We’re really more interested in times before the CMB and spaces beyond the cosmic horizon - on the things outside the watermelon’s green rind.
So I guess if I had to pick at a flaw of this analogy, I’d say that it’s the implication that the watermelon is the whole universe.
As the article states, “To get an idea of what the Universe looks like from Earth’s perspective, picture a big watermelon.” (my emphasis). So it is phenomenological, describing how it appears to us, not how it actually is in reality. Which also seems the most plausible way to interpret Cosmological observations in the Bible.