The highest-energy cosmic rays come from subatomic interactions within star clusters, not supernovae, say physicists. For decades, researchers assumed cosmic rays are flung into space from supernova. But new research suggests even supernovae are not strong enough to push particles to petaelectronvolts (PeVs). Instead, the researchers posit that star clusters like the Cygnus Cocoon serve as PeVatrons capable of moving particles at such high energy rates.
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Source: ScienceDaily