NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Gossamer Penguin solar powered plane in flight. This flight took place on 25th July 1979 at the Rogers Dry Lakebed, Edwards, California, USA. The 3920 solar cells (black, top) generated 541 Watts of power, which drove the plane's propeller (centre right). The plane had a wingspan of 21.6 metres, and weighed just 31 kilograms without the pilot.
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