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Galaxies Found with No Dark Matter

#1
Yazata Offline
So far, there's been a general rule for galaxies that the ratio of dark-matter calculated from the movements of the galaxy's stars and the estimated mass of all the visible stars in the galaxy varies in a generally predictable way depending on the visible mass of the galaxy.

Well, the new development is that astronomers have found a class of very low mass highly diffuse galaxies that don't obey the rule and whose motions suggest that the amount of dark matter present is at least 400 X lower than predicted and consistent with zero.

https://www.nature.com/articles/nature25767

Hypothetical invisible stuff can't be seen! Scientists amazed! (Sorry, couldn't resist that.)
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#2
Syne Offline
More details:

"But the researchers do have some ideas. NGC 1052-DF2 resides about 65 million light-years away in a collection of galaxies that is dominated by the giant elliptical galaxy NGC 1052. Galaxy formation is turbulent and violent, and van Dokkum suggests that the growth of the fledgling massive galaxy billions of years ago perhaps played a role in NGC 1052-DF2's dark-matter deficiency.

Another idea is that gas moving toward the giant elliptical NGC 1052 may have fragmented and formed NGC 1052-DF2. The formation of NGC 1052-DF2 may have been helped by powerful winds emanating from the young black hole that was growing in the center of NGC 1052. These possibilities are speculative, however, and don't explain all of the characteristics of the observed galaxy, the researchers said."
- https://www.nasa.gov/feature/goddard/201...all-galaxy

I don't quite buy into dark matter as being some unknown and unobserved exotic form of matter. I tend to think gravity hasn't given up all its secrets yet.
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