Assertion: gamma ray | /r/CreatedBy | supernova explosions
Facets:
value: in the universe
type: LOCATION
Source sentences:
text: They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes.
text: Gamma rays are produced by violent events such as supernova explosions.
text: They are also produced by supernova explosions as well as by radioactive material in space.