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Published online 13 January 2005 | Nature | doi:10.1038/news050110-18
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Origin of energetic space particles pinpointed
Crashing galaxy clusters send out protons with the energy of golfballs.
A source of ultra-high-energy cosmic rays has been identified for the first time. The extremely energetic particles, racing at almost the speed of light, have been traced back to a pair of colliding galaxy clusters.
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