https://www.youtube.com/watch?v=yXQwr7BhzOM

From Jun 7, 2019.

In this episode, remember that ultra diffuse galaxy I told you about in SFNs 226 and 232?  You know, the one with NO dark matter?  Well turns out there is dark matter there after all.

 

This was always a controversial finding, back in SFN 226 I reported that the group who found Dragonfly 44, an ultra diffuse galaxy with very little dark matter in it, had also taken a closer look at another galaxy, NGC1052-DF2 and wrote a paper, in Nature of all places, announcing that according to their observations, this galaxy rotated just like a galaxy would if it had no dark matter at all in it.

 

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