> Right now, this is the simplest solution we have that fits all observations well. It doesn't though. For instance, the latest in a litany of such failures is

> Right now, this is the simplest solution we have that fits all observations well. It doesn't though. For instance, the latest in a litany of such failures is that rotation curves are flat past a million light years [1]. There is no plausible DM distribution that could reproduce such rotation curves while being consistent with other observations. [1] https://arxiv.org/abs/2406.09685 https://arxiv.org/abs/2406.09685