Next up: a round-the-world solar-powered plane.
Years of hard work and testing have finally paid off. The Solar Impulse, a plane powered solely by solar energy cells, successfully flew through day and night. It spent the early morning of July 7 slowly climbing to an altitude of 8,700 meters to charge its batteries. 4:40pm saw the Solar Impulse take a long controlled dive to 1.5km, then continued flying at through the night without depleting its power reserve.
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