A source of astoundingly energetic γ-rays associated with a star cluster might provide a clue to a century-old question: where do the cosmic rays that constantly bombard Earth come from?
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NASA/JPL–CALTECH/E. CHURCHILL (UNIV. WISCONSIN)
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Butt, Y. The answer is blowing in the wind. Nature 446, 986–987 (2007). https://doi.org/10.1038/446986a
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DOI: https://doi.org/10.1038/446986a
