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The original was posted on /r/space by /u/atomicbunny567 on 2025-06-13 20:50:23+00:00.

JWST has recently found massive well developed galaxies at high redshift (z>13). According to the linked study, these massive galaxies could represent an unexpected foreground contamination of the CMB, which might bring our interpretation of the CMB as a sort of “afterglow” of the big bang into question. It appears to at least suggest that the CMB strength may have been overestimated.

To clarify, I am not an astronomer or astrophysicist although I have studied physics at a graduate level (different subfield entirely however). I found this article and was curious if anyone knowledgeable had commented on it. It seemed strange to me how little attention this appeared to have gotten as it has significant potential to cause a ruckus in cosmology as far as I understand it. I found little commentary aside from a poorly written Newsweek article, so I thought I would try and raise awareness and discussion about this here as I was curious and had some free time on my hands.

If I missed some such discussion or post, let me know because I would like to hear the thoughts of other experts on this study.