Recent observations showed an unusual offset in the position of the dark matter halo of a galaxy in a group of four galaxies of the galaxy cluster Abell 3827.
It is speculated that the offset is caused by interaction other than gravitational between dark matter within the group. QGD predicts the observed offset not caused by a nearby interactions but by a massive structure at a distance of several mega parsecs from the group.
Image by Gemini Observatory/AURA
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