Assertion: cosmic ray | /r/HasProperty | formed
Facets:
value: from stars
type: LOCATION
Source sentences:
text: Maximal energy that particles can reach in such processes is Е max ~ 1021 eV, though there is some controversy about whether cosmic rays of the highest energies (>1016 eV) are formed or not in the methagalaxy.
text: Some cosmic rays are formed from stars, but most come from Supernova explosions.