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extragalactic cosmic ray

very-high-energy particles that flow into the Solar System from beyond the Milky Way galaxy

en-US/ˌɛkstɹəɡəˈlæktɪk ˈkɑzmɪk ˈɹeɪ/
en-GB/ɛkstɹəɡəlæktɪk ˈkɒzmɪk ˈɹeɪ/

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cosmic radiation