Dark matter could finally reveal itself through self-interactions

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 make direct observations.

But the search is not over. A hypothesis about the nature of black matter is that some of them might be self-interacting, which means that the individual particles slightly interact with each other. If true, there would be a host of subtle observational clues for the existence of this subclass of dark matter.

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