The Secret Origins of Cosmic Rays

Where do cosmic rays come from, and what makes them the highest-energy particles in the universe? Until recently, no one knew for sure. But in February, scientists discovered that stellar explosions known as supernovae act like particle accelerators, boosting protons’ speeds enough to turn them into cosmic rays.Subscribe and get 10 issues packed with:The latest news, theories and developments in the world of scienceCompelling stories and breakthroughs in health, medicine and the mindEnvironmental issues and their relevance to daily lifeCutting-edge technology and its impact on our futureRegistration is FREE and takes only a few seconds to complete. If you are already registered on DiscoverMagazine.com, please log in.

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