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From New Atlas:
Some of the strongest evidence for dark matter to date has been discovered – and ironically, that's thanks to its absence. In a pair of studies published this week, astronomers have shed new light on dark matter through close observation of a galaxy previously found to have very little of the stuff, while the same team found a new example of a similar oddball galaxy.
It's generally believed that galaxies are held together through the gravitational influence of clumps of dark matter, so to find a galaxy with little to no dark matter was a surprise. And while it might sound like a strike against the theory, it actually ends up supporting it.
A Second Galaxy Missing Dark Matter in the NGC 1052 Group (DOI: 10.3847/2041-8213/ab0d92) (DX)
Still Missing Dark Matter: KCWI High-resolution Stellar Kinematics of NGC1052-DF2 (DOI: 10.3847/2041-8213/ab0e8c) (DX)
(Score: 1) by khallow on Tuesday April 02 2019, @12:56PM (2 children)
Open cluster data predates 1983. And I don't buy that current MOND-based predictions are based on that theory.
(Score: 0) by Anonymous Coward on Tuesday April 02 2019, @01:12PM (1 child)
You just "don't buy it", because data mentioned in a paper existed before the paper was written. That is your argument now...
This is so sad, on other topics you seemed to have an actual thought process.
(Score: 1) by khallow on Tuesday April 02 2019, @01:51PM
Yes. That's correct. Please recall the key problem. There is no physical explanation for any part of MOND, then or now. It's instead an adjustment to existing theory to explain discrepancies. That's exactly the role of dark matter as well. Both are epicycles.
Further, we have the problem of the gravity environment. Somehow MOND claims that these disperse galaxies are close enough higher mass to have these mechanics, but not the galaxy, NGC 1052 which is generating the external gravitational field in question. NGC 1052, instead has a dark matter halo [hawaii.edu] (possibly with two axes, "Some galaxies (e.g.NGC 1052, M32)are well-fit by two-integral models"). Think about that. Something outside of a galaxy has no MOND effect allegedly due to the external gravitational field of the galaxy, but the galaxy itself does. How did the gravitational field grow that much stronger outside NGC 1052 that it eliminated the MOND effect?