Science Drone

Global Hawk

The Global Hawk, a version of the Air Force's top-of-the-line unmanned spyplane, which will be used by NASA for scientific research, is unveiled at Edwards Air Force Base, Calif., Thursday, Jan. 15, 2009. Capable of staying aloft for more than 30 hours, it will sample greenhouse gases responsible for ozone depletion and verify measurements by NASA's Aura atmosphere research satellite on its first Earth science mission in June. The computer-controlled, high-altitude drone is best known for its surveillance role in Iraq and Afghanistan and has been used to monitor wildfires in the United States. (AP Photo/Reed Saxon)

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