It's worth point out that we have additional direct evidence of dark matter besides the rotation problem, like most thing's it's not perfectly cut an dry smokin

It's worth point out that we have additional direct evidence of dark matter besides the rotation problem, like most thing's it's not perfectly cut an dry smoking gun evidence but: https://en.wikipedia.org/wiki/Bullet_Cluster https://en.wikipedia.org/wiki/Bullet_Cluster https://en.wikipedia.org/wiki/Abell_520 https://en.wikipedia.org/wiki/Abell_520