Rethinking Dark Matter/Dark energy....

[Jehanne]

The Bullet Galaxy proves the existence of dark matter:

The Bullet Cluster provides the best current evidence for the nature of dark matter[4][8] and provides "evidence against some of the more popular versions of Modified Newtonian Dynamics (MOND)" as applied to large galactic clusters.[9] At a statistical significance of 8σ, it was found that the spatial offset of the center of the total mass from the center of the baryonic mass peaks cannot be explained with an alteration of the gravitational force law alone.[10]

https://en.wikipedia.org/wiki/Bullet_Cluster