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A distant supercluster of galaxies points to self-interacting dark matter

Image: Phys.org

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  • Phys.org · October 16, 2026 18:00
    Seven billion light-years from Earth, there is an unexpected cluster of galaxies. It has two regions in the process of colliding with each other with a combined mass of more than two quadrillion solar masses. Given its mass, the distant cluster has been nicknamed El Gordo, the Fat One. What makes…