The following is a comment to a FB posting by Sabine Hossenfelder giving a link to the most recent finding challenging the dark matter halo paradigm. The article titled "A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology" published in Science can be found also in Archiv.
The halo model for dark matter encounters continually lethal problems as I have repeatedly tried to tell in my blog postings and articles. But still this model continues to add items to the curriculum vitae of the specialists - presumably as long as the funding continues. Bad ideas never die.
Halo model predicts that the dwarf galaxies around massive galaxies like Milky should move randomly. The newest fatal blow comes from the observation that dwarf galaxies move along neat circular orbits in the galactic plane of Centaurus A.
Just like the TGD based pearls-in-necklace model of galaxies as knots (pearls) of long cosmic strings predicts! The long cosmic string creates gravitational field in transversal direction and the dwarf galaxies move around nearly circular orbits. The motion along long cosmic string would be free motion and would give rise to streams. The prediction is that at large distances the rotational velocities approach constant just as in the case of distant stars.