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Physicists Use Galaxy Clusters to Uncover Clues of Elusive Axion Particle and Dark Matter Introduction Physicists at Copenhagen University have turned to the colossal magnetic fields within galaxy clusters, using to probe remote black holes while seeking a particle that has long eluded discovery. A story marked by extremes that defy easy understanding. Galaxy Clusters and Axions Galaxy clusters, the universe's heaviest structures, outweigh the sun by a quadrillion fold, while axions remain lighter than the faintest atom. The axion, a proposed fundamental particle, may provide crucial insight into dark matter, thought to comprise around 80% of the universe's mass . For decades, researchers have failed to verify axions. But using a clever method based on far-off galaxies, physicists in Copenhagen could be edging nearer to success. The Universe as a Natural Accelerator Rather than relying on a terrestrial particle accelerator such as CERN, the scientists turned to the universe its...