The Helios Prototype was a solar-powered unmanned aerial vehicle developed by NASA and built by AeroVironment, Inc.
More:
https://www.nasa.gov/centers/dryden/...hUpdate/Helios
Previously:
1963 NASA M2-F1 lifting body - photo and video
Pivoting wing NASA airplane - GIF and video
NASA X-4 Bantam plane that can be broken in two - photo
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