Possibly another nail in the coffin of alternative theories to Dark Matter: fluffy galaxies that don't hold together as much because seem to lack Dark Matter.https://arstechnica.com/science/2018/03/galaxy-seems-to-lack-dark-matter-stumping-astronomers/ …
Well, it is stuff that does not interact interact with 3 of the four forces. There are perhaps a bunch of Dark forces that produce rich internal dark matter dynamics which are hard to observe for us because we don't interact with any of them?
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Thanks. No point debating, since we simply don’t know yet. I was simply interested in your thinking/guess. I hope you are right, because that’ll be very interesting science. I still favour gravity understanding tweaks. More data needed.
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Personally, I felt the same until I learned there was evidence for local disparities in the matter/dark matter distribution that could not be explained with a uniform correction term.
End of conversation
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