Il volo di prova avrà una durata di 25 ore no stop, giorno e notte, prima tappa di una serie di tentativi che lo porteranno entro tre anni a un volo attorno al mondo

(EPA/DENIS BALIBOUSE)

Solar Impulse’s CEO and pilot Andre Borschberg steers the solar-powered HB-SIA prototype airplane for its first night flight attempt at Payerne airport, Switzerland, on 07 July 2010. The propeller plane, with a 61-metre (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.