Astronomers have untangled a messy collision between two massive clusters of galaxies in which the clusters' vast clouds of dark matter have decoupled from the so-called normal matter. The two clusters each contain thousands of galaxies and are located billions of light-years away from Earth.
Dark matter flies ahead of normal matter in mega galaxy cluster collision retrieved 24 July 2024 from https://phys.org/news/2024-07-dark-flies-mega-galaxy-cluster.html
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