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Published online 9 November 2007 | Nature | doi:10.1038/news.2007.233
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High-energy cosmic rays traced to source
Supermassive black-hole galaxies spin out super-energetic particles.
The highest-energy cosmic rays that bombard Earth have been traced to their source — rare galaxies with supermassive black holes at their centre.
A collaboration of more than 370 scientists working with the Pierre Auger Observatory in Argentina tracked the rays by pointing particle detectors skywards and tracing high-energy hits back to the objects that were most likely to have produced them.
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