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Solar Impulse 2, piloted by Bertrand Piccard, flies above San Francisco before a scheduled landing at Moffett Field NASA Ames Research Center in Mountain View, California on April 23, 2016. 
Solar Impulse 2 is attempting to be the first solar-powered airplane to fly around the world without using fuel. / AFP / Josh Edelson        (Photo credit should read JOSH EDELSON/AFP/Getty Images)
Solar Impulse 2, piloted by Bertrand Piccard, flies above San Francisco before a scheduled landing at Moffett Field NASA Ames Research Center in Mountain View, California on April 23, 2016. 
Solar Impulse 2 is attempting to be the first solar-powered airplane to fly around the world without using fuel. / AFP / Josh Edelson        (Photo credit should read JOSH EDELSON/AFP/Getty Images)

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    On board Solar Impulse 2

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On board Solar Impulse 2

From 3,000 feet over the Atlantic aboard the Solar Impulse 2, Bertrand Piccard says he feels like he's in a science fiction film.

On board Solar Impulse 2

From 3,000 feet over the Atlantic aboard the Solar Impulse 2, Bertrand Piccard says he feels like he's in a science fiction film.