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Astrophysics

Cosmic Rays Originate Far Beyond the Milky Way

Scientists have hypothesized that cosmic rays might originate in the Milky Way, but a dozen years of observational data points to extragalactic origins.

Scientists collected a dozen years of data on cosmic rays at the Pierre Auger Observatory in Argentina. | Pierre Auger Observatory
University of Nebraska-Lincoln physics professor Gregory Snow stands near one of the cosmic ray particle detectors used by the Pierre Auger Observatory in Argentina. | Pierre Auger Observatory