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magnetic field strength.
However, cosmic rays have been observed at much higher energies than supernova remnants can
generate, and where these ultra-high-energies come from is a big question. Perhaps they come from
outside the Galaxy, from active galactic nuclei, quasars or gamma ray bursts. Or perhaps they're the
signature of some exotic new physics: superstrings, exotic dark matter, strongly-
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interactingneutrinos, or topological defects in the very structure of the universe. Questions like
these tie cosmic-ray astrophysics to basic particle physics and the fundamental nature of the
universe.
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