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Scientists detect the most powerful cosmic rays ever
How It Works UK
|Issue 198
Scientists have detected the most energetic cosmic rays ever discovered, and they're being produced by mysterious sources relatively close to Earth.
The rays, which consist of electrons and their antimatter counterparts, positrons, were observed at energies all the way up to 40 teraelectronvolts (TeV), or 40,000 times the energy of visible light. Spotted by the High Energy Stereoscopic System (HESS) array in Namibia, the rays lose energy as they travel through space due to their interactions with light and magnetic fields. This means that for rays of this energy to be detected, their sources must be relatively nearby. Yet what exactly is producing them remains unknown.
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