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Date: 2013-02-21 02:42:27Quantum electrodynamics Particle physics Radiation Greisen–Zatsepin–Kuzmin limit Ultra-high-energy cosmic ray Cosmic microwave background radiation Photon Neutrino Ionizing radiation Physics Astroparticle physics Cosmic rays | Add to Reading ListSource URL: www.advanced-astronomy-guru-rupnathji.net63.netDownload Document from Source WebsiteFile Size: 799,80 KBShare Document on Facebook |