Particles called axions could reveal how matter conquered the universe

The subatomic particles may already solve two important puzzles of particle physics

Axions, if they exist, may not only be the source of dark matter (blue) in galaxy clusters throughout the universe but could also explain why the universe consists mainly of matter, while antimatter is rare.

CXO/NASA, ESA, CFHT, M.J. Jee/UCD, A. Mahdavi/SFSU

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