Prefer Newsweek on Google to see more of our trusted coverage when you search. Researchers have detected an extremely energetic cosmic ray from an unknown source in the universe. The detection of a ...

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Artist’s illustration of extensive air showers induced by ultra-high-energy cosmic rays. Credit: Toshihiro Fujii/L-INSIGHT/Kyoto University Cosmic rays are highly energetic subatomic particles ...

THE case for the existence of cosmic strings has just been boosted. If confirmed, these one-dimensional threads of energy that can span millions of light years could be the first sign of extra ...