In 2016, a bizarre-looking plane, covered with more than 17,000 solar panels, showed the world a glimpse of the future of flight. With the wingspan of a Boeing 747, but weighing only as much as an SUV, it circumnavigated the Earth without using a drop of fuel.

(SOURCE) https://www.cnn.com/travel/article/skydweller-solar-powered-plane-solar-impulse-climate-scn-spc-intl/index.html