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![LHAASO observatory](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/05/051921_ec_highest-energy-light_feat.jpg?fit=1030%2C580&ssl=1)
The LHAASO observatory (shown), in China, observes ultra high-energy light using detectors spread across a wide area that will eventually cover more than a square kilometer.
Institute of High Energy Physics/Chinese Academy of Sciences