NASA is deploying the uncrewed Global Hawk research aircraft to Guam for the Airborne Tropical Tropopause Experiment (ATTREX).
The mission is studying changes in moisture and chemical composition of the upper atmosphere that can affect Earth’s climate. Instruments onboard the Global Hawk will take measurements in the Pacific Ocean’s tropical tropopause, a layer of the atmosphere between 55,000 and 65,000 feet above sea level.
Source: YouTube