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.
Press
Release: Auger Observatory links highest-energy
cosmic rays to nearby active galactic nuclei
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