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One of the biggest mysteries in astroparticle physics has been the origins of ultrahigh - energy cosmic rays, very high - energy neutrinos, and high - energy gamma rays. (sciencedaily.com)
«It's a very hard problem to attack, maybe the hardest problem in high - energy astrophysics,» says astroparticle physicist Vasiliki Pavlidou of the University of Crete in Heraklion, Greece, who was not involved in the new work. (sciencenews.org)