This Autonomous Solar-Powered Aircraft Will Fly for 90 Days Straight

Five years ago, a plane called Solar Impulse 2 flew around the world without using any liquid fuel. As you might guess from the name, the plane was solar-powered. It wasn’t the fastest—it took almost a year and a half to circumnavigate the globe, traveling 26,718 miles and stopping in 17 different cities. But it … Continue reading This Autonomous Solar-Powered Aircraft Will Fly for 90 Days Straight