If I understand Ethan’s article and the 2 comments so far correctly, there is controversy regarding…
Dan Coleman
2

Here is one recent article by Ethan explaining it:

Basically, the idea is that the missing mass needs to be in a particular configuration to explain the observations we make, and no matter how many black holes and neutron starts we find, they couldn’t explain the observations. From what I gather, the missing mass needs to be in diffuse halos, not in super dense objects, for the equations to work.

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