Baryon asymmetry
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Main article: baryogenesis
The baryon asymmetry problem in astrophysics refers to the apparent fact that the baryons in the universe which have been observed are overwhelmingly matter as opposed to anti-matter. Neither the standard model of particle physics, nor the theory of general relativity provide an obvious explanation for why this should be so. There are competing theories to explain this aspect of the phenomena of baryogenesis, but there is no one consensus theory to explain the phenomenon at this time.
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