Ever since the existence of cosmic rays with individual energies of several Joules was established in the 1960s, speculation has raged as to whether cosmic particles of mean energy of 2 Joules are created in our Milky Way or in distant extragalactic objects.
In a paper that was published in Science on 22 September 2017, the Pierre Auger Collaboration reported observations demonstrating that cosmic rays with energies a million times greater than that of the protons accelerated in the Large Hadron Collider come from much further away than from our own Galaxy.
Read more in our Press Release
Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above 8×1018 eV
The Pierre Auger Collaboration, Science 357 (2017)
[doi: 10.1126/science.aan4338] [arXiv: 1709.07321]
The long Journey of Cosmic Rays
Video by Aurelio Grillo, Pierre Auger Collaboration, and Vincenzo Napolano, INFN Communication Office.
Courtesy of Italian Institute for Nuclear Physics - INFN