The High-Altitude Water Cherenkov Observatory in Puebla, Mexico, is still under construction, but about one-third of the barn-sized water tanks are already accumulating data on higher-energy cosmic rays and gamma rays better than similar sites have done before. "We're getting to the limit of the most energetic [gamma rays]. We're learning about the highest, most powerful accelerators in the universe," said high-energy astrophysicist Magdalena Gonzalez of the National Autonomous University in Mexico City, and a HAWC science coordinator. The tanks gather data about higher-energy cosmic and gamma rays by observing their effects on the atmosphere.

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