he U.S. space agency has deployed a pilot-less global Hawk research aircraft to monitor climate change in the upper atmosphere and discover how changes there are impacting the planet’s climate. The mission is part of NASA’s Airborne Tropical Tropopause Experiment. Over the next few years, the mission will measure the moisture levels and chemical composition of the upper regions of Earth’s lowest atmospheric layer, because it has a major impact on our weather. This is the region which is critical for establishing the humidity of the air entering the stratosphere. Global Hawk left Dryden Research Center in Edwards, California and landed in Andersen Air Force Base in Guan last week. It is set to now begin its science flights for further research.