Could you answer me where the ultra high energy cosmic "radiation" (I know its particles) comes from. I heard a video blog about it several years ago, but the astronomer said, back then, they where not quite sure about it and just had some ideas.

Martin Köster, Reiskirchen, Germany

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"Who does not know anything, must believe everything."
Baroness Marie von Ebner-Eschenbach 1830-1916