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Beyond the 'Muon Puzzle'

Testing hadronic interaction models using hybrid data of the Pierre Auger Observatory

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Space-based laser measured from Earth

An unusual collaboration leads to spectacular results.

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Where do ultra-high-energy cosmic rays come from?

This is still an open question in astroparticle physics and a long-standing mystery that the Pierre Auger Observatory aims to solve.

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Demonstrating Agreement between Radio and Fluorescence Measurements of the Depth of Maximum of Extensive Air Showers

Understanding the origin and nature of ultra-high energy cosmic rays has been one of the driving forces of the field of astroparticle physics. A key piece of information is what type of particles cosmic rays consist of.

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Do black-hole mergers emit ultra-high energy photons?

For the first time, the possible appearance of ultra-high energy photons from merging compact objects such as black holes was tested.

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What is the origin of ultra-high-energy cosmic rays?

The energy spectrum and mass composition data from the Pierre Auger Observatory constrain the source properties.

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