China's Large High Altitude Air Shower Observatory (LHAASO) launched its first set of detectors on April 26, 2019. It marked the beginning of comprehensive research effort in observing and detecting very high energy cosmic rays with the anticipated world most sensitive gamma ray detection facility.

Photo taken on April 26, 2019 shows the unveiling of Tianfu Cosmic Ray Research Center in Chengdu City, southwest China's Sichuan Province. The LHAASO recently began scientific observation of very high energy cosmic rays as it launched operation of its first set of detectors. (Xinhua/Jin Liwang)

Photo taken on April 26, 2019 shows Cao Zhen from the China Academy of Sciences, chief scientist of the Large High Altitude Air Shower Observatory (LHAASO), launching scientific observation and introducing the research data during the ceremony of LHAASO Scientific Observation and unveiling of Tianfu Cosmic Ray Research Center in Chengdu City, southwest China's Sichuan Province. The LHAASO recently began scientific observation of very high energy cosmic rays as it launched operation of its first set of detectors. (Xinhua/Jin Liwang) 

 Aerial photo provided by Institute of High Energy Physics of Chinese Academy of Sciences shows the Large High Altitude Air Shower Observatory (LHAASO) under construction in Daocheng County, southwest China's Sichuan Province, Jan. 16, 2019. The LHAASO recently began scientific observation of very high energy cosmic rays as it launched operation of its first set of detectors. (Xinhua)

Photo provided by Institute of High Energy Physics of Chinese Academy of Sciences shows construction site of the Large High Altitude Air Shower Observatory (LHAASO) in Daocheng County, southwest China's Sichuan Province, Feb. 28, 2019. The LHAASO recently began scientific observation of very high energy cosmic rays as it launched operation of its first set of detectors. (Xinhua) 

 Aerial photo provided by Institute of High Energy Physics of Chinese Academy of Sciences shows the Water Cherenkov Detector in the Large High Altitude Air Shower Observatory (LHAASO) in Daocheng County, southwest China's Sichuan Province, Feb. 22, 2019. The LHAASO recently began scientific observation of very high energy cosmic rays as it launched operation of its first set of detectors. (Xinhua)

Aerial photo provided by Institute of High Energy Physics of Chinese Academy of Sciences shows the Large High Altitude Air Shower Observatory (LHAASO) under construction in Daocheng County, southwest China's Sichuan Province, Jan. 18, 2019. The LHAASO recently began scientific observation of very high energy cosmic rays as it launched operation of its first set of detectors. (Xinhua)

Photo provided by Institute of High Energy Physics of Chinese Academy of Sciences shows the interior of Water Cherenkov Detector in the Large High Altitude Air Shower Observatory (LHAASO) in Daocheng County, southwest China's Sichuan Province, March 28, 2019. The LHAASO recently began scientific observation of very high energy cosmic rays as it launched operation of its first set of detectors. (Xinhua) 

Photo provided by Institute of High Energy Physics of Chinese Academy of Sciences shows technicians working at the Large High Altitude Air Shower Observatory (LHAASO) in Daocheng County, southwest China's Sichuan Province. The LHAASO recently began scientific observation of very high energy cosmic rays as it launched operation of its first set of detectors. (Xinhua)