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.

  • $\begingroup$ A great mystery of the universe $\endgroup$ Commented Dec 30, 2018 at 17:24
  • 6
    $\begingroup$ Possible duplicate of Baryon asymmetry $\endgroup$
    – Kyle Kanos
    Commented Dec 30, 2018 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
    Commented Dec 30, 2018 at 17:35


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