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The Pierre Auger Cosmic Ray Observatory 
is studying ultra-high energy cosmic rays, 
the most energetic and rarest of particles in 
the universe. When these particles strike the 
earth’s atmosphere, they produce extensive air 
showers made of billions of secondary particles. 
While much progress has been made in nearly a century 
of research in understanding cosmic rays with low to moderate 
energies, those with extremely high energies remain mysterious.

The Pierre Auger Observatory is working on solving these mysteries.

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