[FreeFull]

There are observations that point towards dark matter which don't have anything to do with rotation curves. In particular, gravitational lensing, and the effects of mass on the cosmic microwave background. https://en.wikipedia.org/wiki/Bullet_Cluster The Bullet Cluster is very hard to explain with any kind of MOND theory.

[awinter-py]

the bullet cluster is like 'two clusters collided in the visual plane, and now the lensing peaks are correlated with the respective centers of luminosity'

unless I'm missing something, this is mysterious in the exact same way as normal galaxies