View Larger Version | Two experiments have detected unusual patterns in cosmic rays pouring into Earth’s atmosphere. One possible source of the unusual rays, which are actually particles, could be a supernova and its cone of ejected material, illustrated here. Other possible sources could be a pulsar or dark matter. Credit: M. DeBord, R. Ramaty and B. Kozlovsky/GSFC, R. Lingenfelter/UCSD, NASA

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