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Astronomy and space

Astronomy and space

Ultra-high-energy cosmic rays have extra-galactic origins

21 Sep 2017 Hamish Johnston
Night-time photograph of a Cherenkov detector in Argentina
Watching the sky: a Cherenkov detector in Argentina
Proof that ultra-high-energy cosmic rays come from outside the Milky Way has been published by astro

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Hamish Johnston is an online editor of Physics World
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