The NASA Pathfinder, NASA Pathfinder Plus, NASA Centurion and NASA Helios Prototype were an evolutionary series of solar- and fuel-cell-system-powered unmanned aerial vehicles. AeroVironment, Inc. developed the vehicles under NASA's Environmental Research Aircraft and Sensor Technology (ERAST) program. They were built to develop the technologies that would allow long-term, high-altitude aircraft to serve as "atmospheric satellites", to perform atmospheric research tasks as well as serve as communications platforms.
Read more about NASA Pathfinder: Pathfinder, Pathfinder-Plus, Centurion, Helios Prototype, Specifications
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“If we did not have such a thing as an airplane today, we would probably create something the size of NASA to make one.”
—H. Ross Perot (b. 1930)