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Summary form only given. Scientists from 16 countries are building the largest ever Observatory for the Highest Energy Cosmic Particles. In the Argentina pampas, 1,600 water Cherenkov detectors will cover an area of 3,000 square kilometers overlooked by four fluorescence telescopes. The Cherenkov detectors are placed in a 1.5-kilometer triangular grid, powered by solar panels, timed by GPS's, and...
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