Supermassive black-hole galaxies spin out super-energetic particles.
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References
The Pierre Auger Collaboration, Science, 318, 938 - 943, (2007)
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Sanderson, K. High-energy cosmic rays traced to source. Nature (2007). https://doi.org/10.1038/news.2007.233
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DOI: https://doi.org/10.1038/news.2007.233