Why Dark Matter Might Be Axions | Quanta Magazine
Most of the universe’s heft, oddly enough, could come in the form of particles billions of times lighter than the electron — a featherweight itself, as particles go. Streaming through the cosmos in thick hordes, these wispy “axion” particles could deliver a collective wallop as the missing dark matter that appears to outweigh all visible matter 6-to-1.
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