News of the WeekCOSMIC-RAY PHYSICS

New Array Takes Measure of Energy Dispute

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Science  29 Jul 2005:
Vol. 309, Issue 5735, pp. 685-687
DOI: 10.1126/science.309.5735.685

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Summary

The first results from the Pierre Auger Observatory, a gargantuan cosmic ray detector under construction on an ancient lakebed near Malargüe, Argentina, indicate that the apparent energy of ultrahigh-energy cosmic rays depends on which method is used to measure it.