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Swiss adventurer Bertrand Piccard has unveiled a prototype of the solar-powered plane he hopes eventually to fly around the world.
The vehicle, spanning 61m but weighing just 1,500kg, will undergo trials to prove it can fly through the night.
Dr Piccard, who made history in 1999 by circling the globe non-stop in a balloon, says he wants to demonstrate the potential of renewable energies.
The final version of the plane will try first to cross the Atlantic in 2012.