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So that the happiest things in the universe are clusters of galaxies that are a quadrillion times more massive than the Sun. And axions, theoretical particles, are much, much lighter than the lightest atoms. So the axion, it's an identical particle that could provide an understanding of the dark matter, believed to take up most of the mass of the universe. Dark energy accounts for about, I think it's 58%, dark matter 27%. And the rest, regular matter, the stuff we see around us day to day, 5% of the universe. So you can see, regular matter really doesn't make up too much of the universe. So, no one's proving yet the existence of axions, but fact is using this innovative trick involving distant galaxies. And this is a study from the University of Copenhagen. And instead of using a particle accelerator, like the one at CERN, researchers are using the COSMOS. And they use it as a kind of gigantic particle accelerator. Specifically, they're looking for electromagnetic radiation coming from the cores of distance in very bright galaxies, each with a supermassive black hole right in the center.