Hm, could be a result of dual-use technology practice, or a gag on flying saucers :D Or maybe they went too far with artistic license, Vostok 3KA series spacecr

Hm, could be a result of dual-use technology practice, or a gag on flying saucers :D Or maybe they went too far with artistic license, Vostok 3KA series spacecraft had no photovoltaic power sources http://www.spacefacts.de/graph/photo/photos2/vostok_graphic.jpg http://www.spacefacts.de/graph/photo/photos2/vostok_graphic...., though IDK if it was a widely known fact at the time, also idea of using solar power was out there for 5+ years already