Solar-powered airplane test flight

Ground staff prepare the solar-powered HB-SIA Solar Impulse prototype aircraft before a test flight at Payerne airport in Switzerland early morning April 18, 2011. [Photo/Agencies]

Ground staff hold the solar-powered HB-SIA Solar Impulse prototype aircraft after a test flight at Payerne airport April 18, 2011. Picture taken with a fisheye lens. [Photo/Agencies]