Assertion: cosmic ray | /r/CreatedBy | supernova
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Source sentences:
text: The study of data collected by NASA's Fermi Gamma-ray Space Telescope has revealed that cosmic rays, some of the fastest traveling particles in the universe, are produced by supernovae.
text: Experts suggested cosmic rays were created in supernova explosions, but the precise mechanism of how the particles could be accelerated at such high rates of speed was unknown.
text: Ending an astronomical mystery, scientists have confirmed that cosmic rays – high energy subatomic particles – are produced within at least one supernova.