Ultra-High-Energy Cosmic Rays Come From Galaxies Far, Far Away (5 of 7) (IMAGE)

American Association for the Advancement of Science (AAAS)

Ultra-High-Energy Cosmic Rays Come From Galaxies Far, Far Away (5 of 7)

Caption

One of four fluorescence detector buildings of the Pierre Auger Observatory in western Argentina. The fluorescence detectors measure the faint ultraviolet light emitted by cosmic-ray air showers streaking through the atmosphere. This material relates to a paper that appeared in the Sept. 22, 2017, issue of Science, published by AAAS. The paper, by The Pierre Auger Collaboration, and colleagues was titled, "Observation of a large-scale anisotropy in the arrival directions of cosmic rays above 8 × 1018 eV."

Credit

The Pierre Auger Observatory

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