The origin of the cosmic rays that bombard Earth has troubled physicists for nigh on a century. Supernova remnants are a favoured source — but we should keep our minds open to alternatives.
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Plaga, R. Rays from the dark. Nature 453, 48–49 (2008). https://doi.org/10.1038/453048a
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DOI: https://doi.org/10.1038/453048a
