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by ncmncm 1916 days ago
I am referring to [0]. Tl;dr: Galaxy rotation curves are accounted for by ordinary General Relativity. At least for some. My comment turns out to refer to another article [1] linked from TFA, referring to a different sighting, that says "the lensing galaxy which hosts the radio source contains an unexpectedly low fraction of mysterious dark matter".

Usually we hear about lensing by galaxy clusters, not individual galaxies. If galaxies are short on DM, but clusters aren't, that seems to say something about how DM is distributed.

[0] <https://www.sciencedaily.com/releases/2021/03/210304145458.h...>

[1] <https://phys.org/news/2014-06-herschel-key-discovery-spectac...>