Roughly 85 percent of the mass in the universe is missing. Known as dark matter, this stuff is invisible but makes itself known through very weak interactions with regular matter, and physicists have been hunting for it for decades. Hypothetical particles called axions are a long-standing candidate, but a new experiment has now found that they don't exist – at least within a certain mass range.
.. Continue Reading Missing in axion: Dark matter experiment rules out more candidate particlesCategory: Physics
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