File:Drawinggiuliavarale2.jpg

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English: If part of the radioactivity on Earth it is of extraterrestrial origin, we expect to measure more ionization in altitude than at sea level, and less ionization underwater. Hess and Pacini used these two techniques to demonstrate the existence of cosmic rays.
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Author Giulia De Angelis

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current20:27, 22 October 2011Thumbnail for version as of 20:27, 22 October 20111,193 × 827 (43 KB)Alessandro.de.angelis (talk | contribs)

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