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Nature 456, xiii (20 November 2008) | doi:10.1038/7220xiiib; Published online 19 November 2008

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Galactic cosmic rays — high-energy charged particles that result from hugely energetic processes — are one of the few ways to directly measure matter from outside the Solar System. In 2000, Jin Chang, now an astrophysicist at the Purple Mountain Observatory in Nanjing, China, and a group of international colleagues first detected an excess of high-energy cosmic-ray electrons using the Advanced Thin Ionization Calorimeter (ATIC).

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