Assertion: primary cosmic ray | /r/HasSubevent | the emission of new rays
Facets:
Source sentences:
text: The difference between primary and secondary cosmic rays is essentially one of convenient classification rather than of fundamental type: primary cosmic rays are those which are created by external sources like our own Sun, while secondary cosmic rays are those which are created when primary cosmic rays interact with matter in the interstellar medium, resulting in the emission of new rays.