It is believed that most of the stable beryllium in the universe was originally created in the interstellar medium when cosmic rays induced fission in heavier elements found in interstellar gas and dust.
Det menes, at den meste af den stabile beryllium i universet oprindeligt blev skabt i det interstellare medium, da kosmisk stråle-induceret fission i tungere grundstoffer, der findes i interstellar gas og støv.