Video: 'Revolutionary' solar plane makes maiden flight in Switzerland

Swiss residents witnessed the first flight of the 'revolutionary' Solar Impulse 2 airplane. The plane is currently the only one that can fly day and night on solar power alone. This single-seater aircraft is constructed with carbon fiber, with a wingspan of 72 meters (236FT) and weighs 2,300 kg (5070 LB). In order to function at night, the aircraft recharges 633 kg (2077 LB) of lithium batterie ...