Self-interacting dark matter could finally reveal itself

Despite loads 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 of it.

But the search is not over. One hypothesis for the nature of dark matter is that some of it could be self-interacting, meaning the individual particles interact slightly with one another. If this is true, there would be a host of subtle observational clues for the existence of this subclass of dark matter.

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