L'aereo sperimentale a energia solare Solar Impulse è decollato stamani da un aeroporto svizzero per un volo di prova

(EPA/DOMINIC FAVRE/KEYSTONE)

Solar Impulse’s CEO and pilot Andre Borschberg steers the solar-powered HB-SIA prototype airplane after it took off 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.