The Solar Impulse, a solar-powered plane, flies over Switzerland. The makers will be journeying across the U. this spring, hoping the flight helps challenge assumptions about what solar technology can do. Courtesy of Solar Impulse
Solar Impulse is the name of a Swiss long-range experimental solar-powered aircraft project. Solar Impulse is the only airplane of perpetual endurance, able to fly day and night on solar power, without a drop of fuel.