Denis Balibouse

German test pilot Markus Scherdel steers the solar-powered Solar Impulse 2 aircraft during a training flight at its base in Payerne September 27, 2014. The aircraft, which was unveiled April 9, weighs 2.4 tons with a wingspan of 72 meters (236 ft.) and has more than 17,000 solar cells. The attempt to fly around the world in stages using only solar energy will be made from March 2015 starting from Abu Dhabi. REUTERS/Denis Balibouse