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Nature 453, 48-49 (1 May 2008) | doi:10.1038/453048a; Published online 30 April 2008

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Astrophysics: Rays from the dark

Rainer Plaga1

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The origin of the cosmic rays that bombard Earth has troubled physicists for nigh on a century. Supernova remnants are a favoured source — but we should keep our minds open to alternatives.

Cosmic rays fall in a steady, imperceptible rain onto Earth. Despite their stealth, they are thought to influence both the climate of our planet and the evolution of its inhabitants.

  1. Rainer Plaga is in the Department for New Technologies and Scientific Foundations, Federal Office for Information Security (BSI), 53175 Bonn, Germany.
    Email: rainer.plaga@bsi.bund.de