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A Window on the Ultra-High Energy Universe

Published online by Cambridge University Press:  30 March 2016

Pasquale Blasi
Pasquale Blasi*
Affiliation:
INAF/Osservatorio Astrofisico di ArcetriLargo E. Fermi, 5 – 150125 Firenze, Italy

Abstract

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Cosmic rays with energy around and in excess of 1020 eV have been detected. Despite the uncertainties associated with the difficult measurements of extremely low fluxes (about a particle per square kilometer per century) the same existence of such high energy cosmic rays raises important questions that deserve an appropriate answer. I briefly summarize here what are these questions and how to look for the answers.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 34 - 37
Copyright
Copyright © Astronomical Society of Pacific 2005

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