This would be the Solar Impulse, an airplane being developed in Switzerland whose longest fligt to date has been 87 minutes. The eventual goal is that the plane can fly all the way around the world entirely on solar power. Its designers are very excited about their progress so far (the farthest it had flown before its 87 minute flight was about a quarter of a mile about 3 feet above the runway). Within comparitively little time, we may be flying around in airplanes powered partially or entirely by the sun.
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