File:Crshower2 nasa.jpg

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Crshower2_nasa.jpg ‎(800 × 600 pixels, file size: 87 KB, MIME type: image/jpeg)

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English: It is now known that most cosmic rays are atomic nuclei. Most are hydrogen nuclei, some are helium nuclei, and the rest heavier elements. The relative abundance changes with cosmic ray energy -- the highest energy cosmic rays tend to be heavier nuclei. Although many of the low energy cosmic rays come from our Sun, the origins of the highest energy cosmic rays remains unknown and a topic of much research. This drawing illustrates air showers from very high energy cosmic rays.
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Source http://apod.nasa.gov/apod/ap060814.html
Author Simon Swordy
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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current13:13, 20 November 2009Thumbnail for version as of 13:13, 20 November 2009800 × 600 (87 KB)Pieter Kuiper (talk | contribs){{Information |Description={{en|1=It is now known that most cosmic rays are atomic nuclei. Most are hydrogen nuclei, some are helium nuclei, and the rest heavier elements. The relative abundance changes with cosmic ray energy -- the highest energy cosmic

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