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RE: Is standard cosmology challenged by the structure of the galaxies?
Sound's like the model just need's to be tweaked a little. When I looked at the original paper they do suggest that galaxy collisions and the subsequent tidal stream that forms could condense into dwarf galaxies which would indeed likely be in the same plane.
Yes, this suggests that the current paradigm must be optimized a little bit. But how? :D
That 's out of my area I'm afraid, but I do know somebody that specializes in the study of tidal streams from galaxies. I might post him a message about that article to see if he has any thoughts about this.
By 'but how', I was actually meaning this opens a field of research. You don't need to provide me an answer :)
Ah yes, I misinterpreted that :)