Photovoltaic cells held in a honeycomb structure sandwiched between layers of carbon fiber are the power source for a solar-powered plane that its creators plan to fly around the world. The Solar Impulse team is testing the craft now in flights across the U.S. in preparation for the circumnavigation. The plane's wings -- with a span of 208 feet, about the same as a Boeing 747's -- hold the PV cells, which power four 10 horsepower motors that will pull the Solar Impulse along at an average airspeed of 43 mph.

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