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Science 5 January 2007:
Vol. 315. no. 5808, pp. 68 - 70
DOI: 10.1126/science.1136640
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Perspective

Cosmic Rays: The Highest-Energy Messengers

Angela V. Olinto

The origin of the most energetic particles ever observed, cosmic rays, will begin to be revealed in the next few years. Newly constructed ultrahigh-energy cosmic ray observatories together with high-energy gamma-ray and neutrino observatories are well positioned to unveil this mystery before the centenary of their discovery in 2012. Cosmic ray sources are likely to involve the most energetic phenomena ever witnessed in the universe.

Department of Astronomy and Astrophysics, Enrico Fermi Institute, Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA.

E-mail: olinto{at}kicp.uchicago.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)