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Electrons appear in electron clouds of atoms but positrons are found in cosmic rays and radioactive elements. Why do electrons seem more common then positrons?

Edit: Is this an example of asymmetry? I haven't studied it much yet.

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  • $\begingroup$ A great mystery of the universe $\endgroup$ – BioPhysicist Dec 30 '18 at 17:24
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    $\begingroup$ Possible duplicate of Baryon asymmetry $\endgroup$ – Kyle Kanos Dec 30 '18 at 17:34
  • $\begingroup$ There are other similar questions on the subject of the asymmetry, some of which are linked in the above linked duplicate. $\endgroup$ – Kyle Kanos Dec 30 '18 at 17:35

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