Scientists are deploying vast arrays on Earth to search for the origin of the most energetic particles in the universe.
Ultrahigh-energy cosmic rays twist and turn on their way to Earth, which has made it nearly impossible to identify the colossal monsters that create them. by Natalie Walchover
First measurement of the fluctuations in the number of muons in air showers at ultra-high energies.
Enhanced measurements of muons in air showers will allow improved estimations of the chemical composition of cosmic rays at the Pierre Auger Observatory.
The observatory has made detailed information about an initial selection of its recorded cosmic-ray events available for outside scientists to use.
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