The solar-powered plane Solar Impulse is preparing for a journey around the world scheduled to begin on May 1. It is powered by about 12,000 photovoltaic cells that cover its massive wings. They allow it to charge its batteries and enable it to fly day and night without jet fuel. Above, the Solar Impulse glides over the Golden Gate Bridge in San Francisco.
The plane has the wing span of a commercial aeroplane but the weight of the average family car, making it vulnerable to bad weather
Solar Impulse pilots Bertrand Piccard (L) and Andre Borschberg
The Solar Impulse glides over the Golden Gate Bridge in San Francisco during a test flight
The Solar Impulse lands following a test flight as a cyclist keeps pace at Moffett Field in Mountain View, California
A crew member stands beneath the Solar Impulse following a test flight
Solar Impulse is considered to be the world's most advanced sun-powered plane
Crew members return the Solar Impulse to its hangar following a test flight at Moffett Field in Mountain View, California
The Solar Impulse piloted by Bertrand Piccard
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