Here’s what you’ll learn when you read this story:Flying on solar power isn’t easy, but the U.S.-based startup Skydweller Aero thinks they may have a winning design. Lithium-ion batteries packed inside electric cars deliver mileage per charge similar to gasoline-powered cars, and electric trains have been around for nearly 150 years. It’s a difficulty that’s been thoroughly explored by solar-powered electric planes like Solar Impulse, which completed a piloted round-the-world flight back in 2016. Powered by the Sun, the company estimates that it can stay airborne for at least three months at a time—if not longer. Of course, power is only part of the issue—the Skydweller’s aviation software also has to continuously run without error.