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Pathfinder aircraft test flight, USA, July 27, 1995. The Pathfinder was one of several unmanned aircraft being evaluated under NASA's Environmental Research Aircraft and Sensor Technology (ERAST) program. Pathfinder was a lightweight, solar-powered, remotely piloted flying wing aircraft used to demonstrate the use of solar power for long- duration, high-altitude flight. Pathfinder aircraft test flight, USA, July 27, 1995. Creator: NASA. (KEYSTONE/HERITAGE IMAGES/HERITAGE SPACE)