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Nature 395, 15-16 (3 September 1998) | doi:10.1038/25598

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High-energy astrophysics:  Cosmic rays without end

Michael Hillas1

Cosmic rays are highly energetic particles — mostly protons and atomic nuclei — that strike the Earth from space. They were first detected in 1912, but an understanding of their origin has been slow to arrive.

  1. Michael Hillas is in the Department of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK.
    e-mail: Email: a.m.hillas@leeds.ac.uk