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Re:The case of the missing dark matter: new suspect found in... by T-A on Friday November 27, 2020 @10:06PM (#25234892)
Most dark matter is expected to reside in a halo, much larger than the visible part of the galaxy:

https://en.wikipedia.org/wiki/Dark_matter_halo

So it's more weakly bound than most of the stars. Technically, it's outside the tidal radius:

https://academic.oup.com/mnras/article/366/2/429/1213793

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