Friday, October 16, 2026

A Distant Supercluster of Galaxies Points To Self-Interacting Dark Matter

Hubble image of the El Gordo supercluster with the estimated dark matter highlighted in blue. Credit: NASA Hubble

The El Gordo supercluster is unusually large given its distance. How could such a large galaxy cluster form so quickly? The answer could be that dark matter is self-interacting in an interesting two-state way.



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