German test pilot Markus Scherdel takes off in the solar-powered prototype airplane "Solar Impulse" from the airbase in Payerne, Switzerland, on Wednesday, April 6, 2011 for the first test flight in 2011. Solar Impulse is ultimately aiming for the aviator's dream of "perpetual flight" and to prove a point by flying through the night. The propeller plane, with a 61-meter (200-foot) wingspan, is powered by four electric motors and designed to fly day and night by saving surplus energy from its 12,000 solar cells in high-performance batteries. (AP Photo/Keystone, Dominic Favre)