Self-interacting dark matter can finally reveal itself

Despite plenty of circumstantial evidence for the existence of dark matter – the mysterious form of matter that dominates galaxies and clusters – astronomers have yet to directly observe it.

But the search is not over yet. One hypothesis about the nature of dark matter is that some of them can be self-reactive, which means that individual particles interact little with each other. If this were true, there would be a host of careful observational evidence for the existence of this subclass of dark matter.

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